SEQUENCE CONTROL (SEQUENCE TABLE)
Engineering Course
SEQUEN CE CON TROL
( SEQUEN CE TABLE)
PT. Yo ko g a wa Indo ne sia
Wisma Aldiron Dirgantara 2nd floor, suite 202-209
Jl. Jend. Gatot Subroto Kav.72 Jakarta 12780
Phone : 021-799 0102, Fax : 021-799 0070
TYPES OF SEQUENCE CONTROL BLOCKS
The following funct ion blocks are cat agorized as sequence
cont rol blocks:
1.Sequence Table Blocks
2.Logic Chart Block
3.Sequent ial Funct ion Chart Block
4.Swit ch I nst rum ent Blocks
5.Sequence Elem ent Blocks
6.Valve Monit oring Block
PT YOKOGAWA INDONESIA
Training Center – Technical Support Group
TYPES OF SEQUENCE CONTROL BLOCKS ( 1/ 2)
Sequence Table Blocks
This funct ion blocks realizes sequence cont rol by operat ing ot her funct ion blocks and/ or
process or soft ware I / O.
There are t wo basic t ype of Sequence Table blocks:
• Sequence Table Block ST16
• Rule Ext ension Block ST16E
On t op of t he basic t ypes above, t here are also ot her t ypes such as
Sequence Table Block M_ST16
( Num ber of condit ion signals: 32 t o 64, num ber of act ion signals: 32 t o 64 / Tot al 96)
Rule Ext ension Block M_ST16
Sequence Table Block L_ST16
( Num ber of condit ion signals: 64, num ber of act ion signals: 64 / Tot al 128)
Rule Ext ension Block L_ST16
The condit ions & operat ions are arranged in t he t able form at & specifies w hich operat ion
is perform ed by t he com binat ion of condit ions.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Table block ( ST16, ST16E) is a decision t able t ype funct ion block t hat describes
t he relat ionship bet ween input signal and out put signal in a Y/ N ( Ye s/ N o) fashion.
The ST16 block has a sequence cont rol funct ion t hat handles a t ot al of 64 I / O signals and 32
rules. The I / O signals can also be redist ribut ed in t he 8- signal unit .
The rule ext ension block ( ST16E) is used for ext ending t he rules of ST16 block. I t connect s
t o an ST16 block and only allows connect ion t o a st ep- t ype ST16 block. Hence, it cannot be
used/ act ivat ed independent ly.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
I / O connect ion is set by describing
connect ion inform at ion & dat a in t he
input connect ion inform at ion set t ing
area, condit ion set t ing area, out put
connect ion inform at ion set t ing area &
operat ion specificat ion set t ing area of
t he sequence t able.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
When t he phase st ep sequence t able is used, t he num ber of processes ( num ber of st eps)
m ay be insuficient depending on t he process t hat is being perform ed.
Solu t ion: use t he rule expansion form at sequence t able block ( ST16E) t o expand t he
num ber of rules.
PT YOKOGAWA INDONESIA
Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• Con dit ion Sign a l
Ent er t he elem ent sym bol in t he Tag Nam e Dat a
I t em colum n ( eg. FC002.ALRM) and condit ion
specificat ion in t he Dat a colum n ( eg. HI ) .
• Act ion Sign a l
Ent er t he elem ent sym bol in t he Tag Nam e Dat a
I t em colum n ( eg. % AN0010.PV) and act ion
specificat ion in t he Dat a colum n ( eg. H) .
• Ru le N u m be r
Up t o 32 rules per block m ay be used. The
out put is based on each rule condit ion and
condit ion t est ing result .
• Condit ion Rule
Use Y/ N pat t ern ( in com binat ion) t o condit ion
rule. I f t he t est ing result of condit ion signal
corresponds wit h t he Y/ N pat t ern, t he condit ion
is t hen said sat isfied.
• Act ion Ru le
Use Y/ N pat t ern ( in com binat ion) t o act ion rule.
I f t he t he t est ing result of condit ion signal is
sat isfied, act ion rule will be m anipulat ed
according t o t he Y/ N pat t ern.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• St e p La be l
St ep labels are used for phase indicat ion when
perform ing st ep sequence cont rol in t he
Sequence Table. The labels are charact er st rings
t hat com bine t wo or less alphanum eric
charact ers ( A t o Z, 0 t o 9) .
• N e x t St e p La be l
TH EN
Execut e t he next st ep label when t he
corresponding rule condit ion st at us is t rue or
sat isfied & aft er t he m anipulat ed out put is
com plet ed.
ELSE
Execut e t he next st ep label when t he
corresponding rule st at us is false.
• Ta g N a m e .D a t a I t e m
Describe t he connect ion inform at ion of t he
condit ion and act ion signal ( eg. FC001.MODE,
FC001.PSW, TI MER001.OP, et c) .
• Data
Describe t he specificat ion of condit ion and act ion
signal ( eg. AUT, HI , L, H, STOP, RUN, et c) .
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• Com m e n t
Com m ent s are defined by user t o describe t he m eaning
of sym bols & cont ent s of st at us m anipulat ion of
condit ion & act ion rules.
• Pr oce ssin g Tim in g
There ara t wo processing t im ings:
St a r t / Ex e cu t ion Tim in g
I t refers t o t he t im ing at which cont rol algorit hm s are
execut ed when receiving input signals. Select one of t he
following t ype
- Periodic Execut ion ( T)
- One- Shot Processing ( O)
- St art up at I nit ial Cold St art / Rest art of FCS ( I )
- Rest rict ed I nit ial Execut ion ( B)
Out put Tim in g
I t indicat es t he condit ion or behaviour of act ion signals
in conj unct ion wit h t he condit ion rule st at us change
( applicable wit h T & O t ype of St art Tim ing only) .
Select eit her
- Out put Only When Condit ion Change ( C) or
- Out put Each Tim e Condit ions Are Sat isfied ( E)
• Sca n Pe r iod
Sequence t able wit h periodic execut ion t ype ( T) is
act ivat ed at defined scan period.
There are t hree t ypes of scan periods:
- Basic Scan ( 1 second – fixed)
- Medium Speed Scan ( 200 & 500 m illiseconds)
50, 100, 250 m illiseconds are also applicable.
- High Speed Scan ( 200 & 500 m illiseconds)
50, 100, 250 m illiseconds are also applicable.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
St art / Execut ion Tim ing
Periodic Execut ion ( T)
The periodic execut ion m eans t hat t he sequence cont rol block is repeat edly execut ed in a
preset cycle.
One - Shot Execut ion ( O)
When execut ion t im ing of a funct ion block is defined as one- shot t ype, t he block is execut ed
only when it is invoked by ot her funct ion block. A one- shot funct ion block can invoke anot her
one- shot funct ion block. How ever, such succession is lim it ed t o seven blocks. I nvocat ion can
only be init iat ed from t he sam e FCS.
I nvocat ion signal
ACT.ON
I nvoking funct ion
block
ACT.OFF
Sequence process execut ion
Execut ing
One- shot t ype
funct ion block
I dle
One - Shot Pr oce ssing Conce pt ua l D ia gr a m
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
St art / Execut ion Tim ing
I nit ial Execut ion/ Rest art Execut ion ( I )
I n t his execut ion t ype, t he sequence block execut es it s process when t he FCS perform s a cold
st art or a rest art .
Rest rict ed I nit ial Execut ion ( B)
I n rest rict ed init ial execut ion, t he sequence cont rol block execut es only when t he FCS
perform s a cold st art , not include rest art .
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Out put Tim ing
Out put Only When Condit ions Are Changed ( C)
The sequence t able blocks out put an operat ion/ act ion signal only at t he t im ing when t he
j udged condit ions are changed from false t o t rue. This is applicable only wit h periodic
execut ion ( T) or one- shot st art ( O) st art t im ing.
Condit ion det ect ion
( a ch a nge from false t o t rue st at e)
True
Condit ion rule
change
False
Act ion change/ int erupt ion is
possible event hough t he
condit ions rule are sat isfied
True
Act ion rule
change
False
“Out put On ly W he n Con dit ions Ar e Cha n ge d” Con ce pt ua l Figu r e
N ot e :
However, if non- lat ched out put is specified for t he act ion signal, t he operat ion changes when t he
condit ion is swit ched from t rue t o false.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Out put Tim ing
Out put Each Tim e Condit ions Are Sat isfied ( E)
The sequence t able blocks out put it s operat ion/ act ion signal every scan period as long as t he
j udged condit ions are sat isfied.
Condit ion det ect ion
( false or t rue st at e)
True
Condit ion rule
change
False
Act ion change/ int erupt ion is
not possible as long as t he
condit ion rem ains sat isfied.
True
Act ion rule
change
False
“Out put Ea ch Tim e Con dit ions Ar e Sa t isfie d” Con ce pt ua l Figu r e
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Execut ion & Out put Tim ing Com binat ion
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Descript ion Exam ple ( AND Gat e)
The basic logical AND gat e can be configured in a Sequence Table
as follow:
I n t he exam ple above, only when all condit ions signals are
sat isfied t he act ion/ out put operat ion m ay be perform ed.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Descript ion Exam ple ( OR Gat e)
The basic logical OR gat e can be configured in a Sequence Table
as follow:
I n t he exam ple above, when any of condit ions signals is sat isfied
t he act ion/ out put operat ion m ay be perform ed.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of Non- St ep Sequence
I n a non st ep sequence t able, all 32 rules are subj ect t o condit ion t est ing and t he
out put operat ion is perform ed according t o t he condit ions.
As for condit ion t est ing, a condit ion is
sat isfied when all condit ions ( Y/ N) for t he
sam e rule num ber are t rue. Rule colum n
t hat is blank is considered t rue
uncondit ionally.
Operat ions/ act ions are execut ed according
t o t he operat ion cont ent s of Y/ N pat t erned
for t he rule num ber whose condit ions are
sat isfied.
When t he condit ions of m ult iple rules are
sat isfied sim ult aneously wit h respect t o
t he sam e act ion signal, if request for bot h
Y/ N are det ect ed as t he result ant
operat ions, t he request for Y t akes
precedence and t he operat ion for N will
not be execut ed.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of Non- St ep Sequence ( Exam ple)
Here is an exam ple of t he sequence t hat norm ally
m onit ors operat ion t o prevent t he buffer t ank in t he
processing piping syst em from overflow. The sequence
t able below m onit ors t he condit ions in rule num bers 01
t o 04 sim ult aneously. I f any condit ion becom es t rue,
t he act ion/ operat ion in t he sam e rule will be execut ed.
The m onit oring cont inues aft er t he execut ion.
LAHH100.PV
LAH100.PV
LAL100.PV
LALL100.PV
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence
I n a st ep sequence t able, t he process cont rol sequence of a phase- st ep process is divided int o t he
sm allest phase unit s ( st eps) on t he condit ion m onit oring and operat ion, t hen t hese st eps are
execut ed one by one.
Only st ep label 00 and t he rule corresponding t o t he
Only t he st ep current ly
being execut ed is subj ect
t o condit ion t est ing.
Only t he act ions for t he
rules w hose condit ions
are sat isfied in t he st ep
current ly being execut ed,
are in operat ion.
current st ep num ber are subj ect t o condit ion t est ing &
operat ion.
St ep label 00 is execut ed during each period & it m ay
only be used at t he head of a sequence t able group. So
it cannot be used as a next st ep label.
The next execut ion st ep label m ust be described in
THEN/ ELSE part in order t o advance t he next st ep. I f
bot h are left blank t he sam e st ep is execut ed each t im e
& will not advance.
The next st ep specified in THEN part is t he st ep t o
advance when t he condit ion t est result is sat isfied ( t rue
st at e) .
The next st ep specified in ELSE part is t he st ep t o
advance when t he condit ion t est result is unsat isfied
( false st at e) . I t will proceeds t o t he next st ep wit hout
execut ing t he act ion/ operat ion rules.
I f t here are m ult iple request s for st ep t ransit ion in t he
sam e st ep, t he st ep advances t o t he next st ep label
wit h t he sm allest rule num ber.
The next st ep execut ion is done during t he next scan
period.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence ( Exam ple)
Se qu e n ce Spe cifica t ion
1. Push t he st art but t on
Valve A opens t o fill t he t ank wit h wat er.
2. When t he t ank is full
Sw it ch A becom es ON.
Valve A is closed.
3. Push t he st art but t on again ( wit h t he t ank full of w at er)
Valve B opens t o drain t he t ank.
4. When t he t ank level becom es low
Sw it ch B becom es ON
Valve B is closed
Wat er inj ect ion
processing
( St ep label A1)
Wat er drain
processing
( St ep label A2)
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence ( Exam ple)
Wat er inj ect ion
processing
( St ep label A1)
Wat er drain
processing
( St ep label A2)
I n t he above sequence t able, rules num ber 01 & 02 are st ep A1. Rules
num ber 03 & up are st ep A2. Rules num ber o5 and beyond do not have any
Y/ N pat t ern for t he condit ion rule or act ion rule or m ove- dest inat ion st ep
label, so t hey are not subj ect t o condit ion t est ing nor act ion execut ion.
St ep A1 m onit ors t he condit ions for rules num ber 01 & 02 sim ult aneously.
Whichever t he condit ion is sat isfied will be execut ed. Execut ing t he act ion of
rule 01 does not advance t he st ep since t here is no designat ion in t he m ovedest inat ion st ep label. Aft er execut ing t he act ion, A1 resum es m onit oring
rules num ber 01& 02 again. When rule num ber 02 condit ions becom e t rue,
t he act ion of rule 02 is execut ed & t he st ep advances t o A2 as st at ed in t he
m ove- dest inat ion st ep label.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Num ber Of Condit ion & Act ion Signal
By default , sequence t able ST16 has 32 condit ion signals and 32 act ion/ operat ion signals. However,
t his allocat ion of condit ion & act ion signal can be changed on 8- signal unit basis.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Num ber Of Condit ion & Act ion Signal
Ta ble : Com bin a t ion of Con dit ion & Act ion Sign a l Cou n t s
N u m be r Of Con dit ion Sign a l
N u m be r Of Act ion Sign a l
8
56
16
48
24
40
32 ( default )
32 ( default )
40
24
48
16
56
8
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Rule Ext ension
The num ber of rules in one sequence t able is fixed at 32 & cannot be m odified. However, if t he
num ber of rules in a sequence t able is not enough t o describe one phase unit , it can be ext ended in
t he 32- rule unit by connect ing t o anot her sequence t able. The num ber of rules can be ext ended for a
st ep- t ype sequence t able.
Type t he t ag num ber of t he ext ended
sequence t able in t he N EXT box of
t he first / ext ending sequence t able.
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Training Center – Technical Support Group
SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Funct ion Blocks and I / O Dat a)
Funct ion blocks t hat can be processed in a sequence t able are shown below.
Sw it ch I nst rum ent Block
Valve Monit oring Block ( VLVM)
Tim er Block ( TM)
Regulat ory Cont rol Blocks
Soft ware Count er Block ( CTS)
Calculat ion Blocks
Pulse Train I nput Count er Block ( CTP)
Faceplat e Blocks
Code I nput Block ( CI )
SFC Blocks
Code Out put Block ( CO)
Unit I nst rum ent Blocks
Relat ional Expression Block ( RL)
Sequence Table Blocks
Resource Scheduler Block ( RS)
Logic Chart Block
I / O dat a t hat can be processed in a sequence t able are shown below.
Processing I / O ( Digit al I nput / Out put )
Soft ware I / O ( I nt ernal Swit ch, Annunciat or, Global Swit ch)
Com m unicat ion I / O
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Swit ch I nst rum ent & Enhanced Swit ch I nst rum ent Blocks) 1/ 2
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Swit ch I nst rum ent & Enhanced Swit ch I nst rum ent Blocks) 2/ 2
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Tim er Block [ TM] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Soft ware Count er Block [ CTS] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Pulse Train I nput [ CTP] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Code I nput Block [ CI ] )
Condit ion Signal Descript ion ( Code Out put Block [ CO] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Relat ional Expression Block [ RL] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Resource Scheduler Block [ RS] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Valve Monit oring Block [ VLVM] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 1/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 2/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 3/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 4/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 1/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 2/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 3/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 4/ 4
The t able list s t he calculat ion
blocks t hat can be referenced
in t he condit ion signal as oneshot operat ion.
The form at is:
TAGN AM E.ACT.ON
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Faceplat e Block)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Sequent ial Funct ion Chart Block)
The following list s t he dat a
it em s of SFC block t hat can
describe dat a values in
condit ion specificat ions and
t heir set t ing ranges:
STEPN O:
1 to 99
SW CR[ 5 ] : 0 t o 1 5
SW ST[ 5 ] : 0 ,1
SW OP[ 5 ] : - 1 5 t o 1 5
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Unit Supervision Block)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Processing I / O Block)
Condit ion Signal Descript ion ( Global Swit ch)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Soft ware / Com m on Swit ch)
Condit ion Signal Descript ion ( Com m unicat ion I / O)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Annunciat or Message)
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LABORATORY WORKS
Creat e a logic sequence from t hese cont rol narrat ives:
Ca se 1
I n a cascade loop, if t he process variable of t he slave cont roller is HighHigh alarm t hen t he slave cont roller m ode will have t o swit ch t o
CASCADE m ode and t he m ast er cont roller m ode will have t o swit ch t o
AUTO m ode.
However, t he operat or is allowed t o change t he m ode of slave cont roller
t o MANUAL or AUTO m ode even t ough t he process variable is st ill in
High- High alarm st at e.
Ca se 2
I n a cascade loop, if t he process variable of t he slave cont roller is HighHigh alarm t hen t he slave cont roller m ode will have t o swit ch t o
CASCADE m ode and t he m ast er cont roller m ode will have t o swit ch t o
AUTO m ode.
The cont rol m ode of t he slave cont roller cannot be changed unt il t he
alarm vanishes ( process variable is in norm al st at e) .
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PT. Yo ko g a wa Indo ne sia
Wisma Aldiron Dirgantara 2nd floor, suite 202-209
Jl. Jend. Gatot Subroto Kav.72 Jakarta 12780
Phone : 021-799 0102, Fax : 021-799 0070
PT YOKOGAWA INDONESIA
Training Center – Technical Support Group
SEQUEN CE CON TROL
( SEQUEN CE TABLE)
PT. Yo ko g a wa Indo ne sia
Wisma Aldiron Dirgantara 2nd floor, suite 202-209
Jl. Jend. Gatot Subroto Kav.72 Jakarta 12780
Phone : 021-799 0102, Fax : 021-799 0070
TYPES OF SEQUENCE CONTROL BLOCKS
The following funct ion blocks are cat agorized as sequence
cont rol blocks:
1.Sequence Table Blocks
2.Logic Chart Block
3.Sequent ial Funct ion Chart Block
4.Swit ch I nst rum ent Blocks
5.Sequence Elem ent Blocks
6.Valve Monit oring Block
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TYPES OF SEQUENCE CONTROL BLOCKS ( 1/ 2)
Sequence Table Blocks
This funct ion blocks realizes sequence cont rol by operat ing ot her funct ion blocks and/ or
process or soft ware I / O.
There are t wo basic t ype of Sequence Table blocks:
• Sequence Table Block ST16
• Rule Ext ension Block ST16E
On t op of t he basic t ypes above, t here are also ot her t ypes such as
Sequence Table Block M_ST16
( Num ber of condit ion signals: 32 t o 64, num ber of act ion signals: 32 t o 64 / Tot al 96)
Rule Ext ension Block M_ST16
Sequence Table Block L_ST16
( Num ber of condit ion signals: 64, num ber of act ion signals: 64 / Tot al 128)
Rule Ext ension Block L_ST16
The condit ions & operat ions are arranged in t he t able form at & specifies w hich operat ion
is perform ed by t he com binat ion of condit ions.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Table block ( ST16, ST16E) is a decision t able t ype funct ion block t hat describes
t he relat ionship bet ween input signal and out put signal in a Y/ N ( Ye s/ N o) fashion.
The ST16 block has a sequence cont rol funct ion t hat handles a t ot al of 64 I / O signals and 32
rules. The I / O signals can also be redist ribut ed in t he 8- signal unit .
The rule ext ension block ( ST16E) is used for ext ending t he rules of ST16 block. I t connect s
t o an ST16 block and only allows connect ion t o a st ep- t ype ST16 block. Hence, it cannot be
used/ act ivat ed independent ly.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
I / O connect ion is set by describing
connect ion inform at ion & dat a in t he
input connect ion inform at ion set t ing
area, condit ion set t ing area, out put
connect ion inform at ion set t ing area &
operat ion specificat ion set t ing area of
t he sequence t able.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
When t he phase st ep sequence t able is used, t he num ber of processes ( num ber of st eps)
m ay be insuficient depending on t he process t hat is being perform ed.
Solu t ion: use t he rule expansion form at sequence t able block ( ST16E) t o expand t he
num ber of rules.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• Con dit ion Sign a l
Ent er t he elem ent sym bol in t he Tag Nam e Dat a
I t em colum n ( eg. FC002.ALRM) and condit ion
specificat ion in t he Dat a colum n ( eg. HI ) .
• Act ion Sign a l
Ent er t he elem ent sym bol in t he Tag Nam e Dat a
I t em colum n ( eg. % AN0010.PV) and act ion
specificat ion in t he Dat a colum n ( eg. H) .
• Ru le N u m be r
Up t o 32 rules per block m ay be used. The
out put is based on each rule condit ion and
condit ion t est ing result .
• Condit ion Rule
Use Y/ N pat t ern ( in com binat ion) t o condit ion
rule. I f t he t est ing result of condit ion signal
corresponds wit h t he Y/ N pat t ern, t he condit ion
is t hen said sat isfied.
• Act ion Ru le
Use Y/ N pat t ern ( in com binat ion) t o act ion rule.
I f t he t he t est ing result of condit ion signal is
sat isfied, act ion rule will be m anipulat ed
according t o t he Y/ N pat t ern.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• St e p La be l
St ep labels are used for phase indicat ion when
perform ing st ep sequence cont rol in t he
Sequence Table. The labels are charact er st rings
t hat com bine t wo or less alphanum eric
charact ers ( A t o Z, 0 t o 9) .
• N e x t St e p La be l
TH EN
Execut e t he next st ep label when t he
corresponding rule condit ion st at us is t rue or
sat isfied & aft er t he m anipulat ed out put is
com plet ed.
ELSE
Execut e t he next st ep label when t he
corresponding rule st at us is false.
• Ta g N a m e .D a t a I t e m
Describe t he connect ion inform at ion of t he
condit ion and act ion signal ( eg. FC001.MODE,
FC001.PSW, TI MER001.OP, et c) .
• Data
Describe t he specificat ion of condit ion and act ion
signal ( eg. AUT, HI , L, H, STOP, RUN, et c) .
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Com ple t e Se qu e n ce Ta ble
Con figu r a t ion
• Com m e n t
Com m ent s are defined by user t o describe t he m eaning
of sym bols & cont ent s of st at us m anipulat ion of
condit ion & act ion rules.
• Pr oce ssin g Tim in g
There ara t wo processing t im ings:
St a r t / Ex e cu t ion Tim in g
I t refers t o t he t im ing at which cont rol algorit hm s are
execut ed when receiving input signals. Select one of t he
following t ype
- Periodic Execut ion ( T)
- One- Shot Processing ( O)
- St art up at I nit ial Cold St art / Rest art of FCS ( I )
- Rest rict ed I nit ial Execut ion ( B)
Out put Tim in g
I t indicat es t he condit ion or behaviour of act ion signals
in conj unct ion wit h t he condit ion rule st at us change
( applicable wit h T & O t ype of St art Tim ing only) .
Select eit her
- Out put Only When Condit ion Change ( C) or
- Out put Each Tim e Condit ions Are Sat isfied ( E)
• Sca n Pe r iod
Sequence t able wit h periodic execut ion t ype ( T) is
act ivat ed at defined scan period.
There are t hree t ypes of scan periods:
- Basic Scan ( 1 second – fixed)
- Medium Speed Scan ( 200 & 500 m illiseconds)
50, 100, 250 m illiseconds are also applicable.
- High Speed Scan ( 200 & 500 m illiseconds)
50, 100, 250 m illiseconds are also applicable.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
St art / Execut ion Tim ing
Periodic Execut ion ( T)
The periodic execut ion m eans t hat t he sequence cont rol block is repeat edly execut ed in a
preset cycle.
One - Shot Execut ion ( O)
When execut ion t im ing of a funct ion block is defined as one- shot t ype, t he block is execut ed
only when it is invoked by ot her funct ion block. A one- shot funct ion block can invoke anot her
one- shot funct ion block. How ever, such succession is lim it ed t o seven blocks. I nvocat ion can
only be init iat ed from t he sam e FCS.
I nvocat ion signal
ACT.ON
I nvoking funct ion
block
ACT.OFF
Sequence process execut ion
Execut ing
One- shot t ype
funct ion block
I dle
One - Shot Pr oce ssing Conce pt ua l D ia gr a m
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
St art / Execut ion Tim ing
I nit ial Execut ion/ Rest art Execut ion ( I )
I n t his execut ion t ype, t he sequence block execut es it s process when t he FCS perform s a cold
st art or a rest art .
Rest rict ed I nit ial Execut ion ( B)
I n rest rict ed init ial execut ion, t he sequence cont rol block execut es only when t he FCS
perform s a cold st art , not include rest art .
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Out put Tim ing
Out put Only When Condit ions Are Changed ( C)
The sequence t able blocks out put an operat ion/ act ion signal only at t he t im ing when t he
j udged condit ions are changed from false t o t rue. This is applicable only wit h periodic
execut ion ( T) or one- shot st art ( O) st art t im ing.
Condit ion det ect ion
( a ch a nge from false t o t rue st at e)
True
Condit ion rule
change
False
Act ion change/ int erupt ion is
possible event hough t he
condit ions rule are sat isfied
True
Act ion rule
change
False
“Out put On ly W he n Con dit ions Ar e Cha n ge d” Con ce pt ua l Figu r e
N ot e :
However, if non- lat ched out put is specified for t he act ion signal, t he operat ion changes when t he
condit ion is swit ched from t rue t o false.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Out put Tim ing
Out put Each Tim e Condit ions Are Sat isfied ( E)
The sequence t able blocks out put it s operat ion/ act ion signal every scan period as long as t he
j udged condit ions are sat isfied.
Condit ion det ect ion
( false or t rue st at e)
True
Condit ion rule
change
False
Act ion change/ int erupt ion is
not possible as long as t he
condit ion rem ains sat isfied.
True
Act ion rule
change
False
“Out put Ea ch Tim e Con dit ions Ar e Sa t isfie d” Con ce pt ua l Figu r e
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Execut ion & Out put Tim ing Com binat ion
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Descript ion Exam ple ( AND Gat e)
The basic logical AND gat e can be configured in a Sequence Table
as follow:
I n t he exam ple above, only when all condit ions signals are
sat isfied t he act ion/ out put operat ion m ay be perform ed.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Sequence Descript ion Exam ple ( OR Gat e)
The basic logical OR gat e can be configured in a Sequence Table
as follow:
I n t he exam ple above, when any of condit ions signals is sat isfied
t he act ion/ out put operat ion m ay be perform ed.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of Non- St ep Sequence
I n a non st ep sequence t able, all 32 rules are subj ect t o condit ion t est ing and t he
out put operat ion is perform ed according t o t he condit ions.
As for condit ion t est ing, a condit ion is
sat isfied when all condit ions ( Y/ N) for t he
sam e rule num ber are t rue. Rule colum n
t hat is blank is considered t rue
uncondit ionally.
Operat ions/ act ions are execut ed according
t o t he operat ion cont ent s of Y/ N pat t erned
for t he rule num ber whose condit ions are
sat isfied.
When t he condit ions of m ult iple rules are
sat isfied sim ult aneously wit h respect t o
t he sam e act ion signal, if request for bot h
Y/ N are det ect ed as t he result ant
operat ions, t he request for Y t akes
precedence and t he operat ion for N will
not be execut ed.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of Non- St ep Sequence ( Exam ple)
Here is an exam ple of t he sequence t hat norm ally
m onit ors operat ion t o prevent t he buffer t ank in t he
processing piping syst em from overflow. The sequence
t able below m onit ors t he condit ions in rule num bers 01
t o 04 sim ult aneously. I f any condit ion becom es t rue,
t he act ion/ operat ion in t he sam e rule will be execut ed.
The m onit oring cont inues aft er t he execut ion.
LAHH100.PV
LAH100.PV
LAL100.PV
LALL100.PV
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence
I n a st ep sequence t able, t he process cont rol sequence of a phase- st ep process is divided int o t he
sm allest phase unit s ( st eps) on t he condit ion m onit oring and operat ion, t hen t hese st eps are
execut ed one by one.
Only st ep label 00 and t he rule corresponding t o t he
Only t he st ep current ly
being execut ed is subj ect
t o condit ion t est ing.
Only t he act ions for t he
rules w hose condit ions
are sat isfied in t he st ep
current ly being execut ed,
are in operat ion.
current st ep num ber are subj ect t o condit ion t est ing &
operat ion.
St ep label 00 is execut ed during each period & it m ay
only be used at t he head of a sequence t able group. So
it cannot be used as a next st ep label.
The next execut ion st ep label m ust be described in
THEN/ ELSE part in order t o advance t he next st ep. I f
bot h are left blank t he sam e st ep is execut ed each t im e
& will not advance.
The next st ep specified in THEN part is t he st ep t o
advance when t he condit ion t est result is sat isfied ( t rue
st at e) .
The next st ep specified in ELSE part is t he st ep t o
advance when t he condit ion t est result is unsat isfied
( false st at e) . I t will proceeds t o t he next st ep wit hout
execut ing t he act ion/ operat ion rules.
I f t here are m ult iple request s for st ep t ransit ion in t he
sam e st ep, t he st ep advances t o t he next st ep label
wit h t he sm allest rule num ber.
The next st ep execut ion is done during t he next scan
period.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence ( Exam ple)
Se qu e n ce Spe cifica t ion
1. Push t he st art but t on
Valve A opens t o fill t he t ank wit h wat er.
2. When t he t ank is full
Sw it ch A becom es ON.
Valve A is closed.
3. Push t he st art but t on again ( wit h t he t ank full of w at er)
Valve B opens t o drain t he t ank.
4. When t he t ank level becom es low
Sw it ch B becom es ON
Valve B is closed
Wat er inj ect ion
processing
( St ep label A1)
Wat er drain
processing
( St ep label A2)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Operat ion Of St ep Sequence ( Exam ple)
Wat er inj ect ion
processing
( St ep label A1)
Wat er drain
processing
( St ep label A2)
I n t he above sequence t able, rules num ber 01 & 02 are st ep A1. Rules
num ber 03 & up are st ep A2. Rules num ber o5 and beyond do not have any
Y/ N pat t ern for t he condit ion rule or act ion rule or m ove- dest inat ion st ep
label, so t hey are not subj ect t o condit ion t est ing nor act ion execut ion.
St ep A1 m onit ors t he condit ions for rules num ber 01 & 02 sim ult aneously.
Whichever t he condit ion is sat isfied will be execut ed. Execut ing t he act ion of
rule 01 does not advance t he st ep since t here is no designat ion in t he m ovedest inat ion st ep label. Aft er execut ing t he act ion, A1 resum es m onit oring
rules num ber 01& 02 again. When rule num ber 02 condit ions becom e t rue,
t he act ion of rule 02 is execut ed & t he st ep advances t o A2 as st at ed in t he
m ove- dest inat ion st ep label.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Num ber Of Condit ion & Act ion Signal
By default , sequence t able ST16 has 32 condit ion signals and 32 act ion/ operat ion signals. However,
t his allocat ion of condit ion & act ion signal can be changed on 8- signal unit basis.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Num ber Of Condit ion & Act ion Signal
Ta ble : Com bin a t ion of Con dit ion & Act ion Sign a l Cou n t s
N u m be r Of Con dit ion Sign a l
N u m be r Of Act ion Sign a l
8
56
16
48
24
40
32 ( default )
32 ( default )
40
24
48
16
56
8
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Rule Ext ension
The num ber of rules in one sequence t able is fixed at 32 & cannot be m odified. However, if t he
num ber of rules in a sequence t able is not enough t o describe one phase unit , it can be ext ended in
t he 32- rule unit by connect ing t o anot her sequence t able. The num ber of rules can be ext ended for a
st ep- t ype sequence t able.
Type t he t ag num ber of t he ext ended
sequence t able in t he N EXT box of
t he first / ext ending sequence t able.
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Funct ion Blocks and I / O Dat a)
Funct ion blocks t hat can be processed in a sequence t able are shown below.
Sw it ch I nst rum ent Block
Valve Monit oring Block ( VLVM)
Tim er Block ( TM)
Regulat ory Cont rol Blocks
Soft ware Count er Block ( CTS)
Calculat ion Blocks
Pulse Train I nput Count er Block ( CTP)
Faceplat e Blocks
Code I nput Block ( CI )
SFC Blocks
Code Out put Block ( CO)
Unit I nst rum ent Blocks
Relat ional Expression Block ( RL)
Sequence Table Blocks
Resource Scheduler Block ( RS)
Logic Chart Block
I / O dat a t hat can be processed in a sequence t able are shown below.
Processing I / O ( Digit al I nput / Out put )
Soft ware I / O ( I nt ernal Swit ch, Annunciat or, Global Swit ch)
Com m unicat ion I / O
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Swit ch I nst rum ent & Enhanced Swit ch I nst rum ent Blocks) 1/ 2
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Swit ch I nst rum ent & Enhanced Swit ch I nst rum ent Blocks) 2/ 2
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Tim er Block [ TM] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Soft ware Count er Block [ CTS] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Pulse Train I nput [ CTP] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Code I nput Block [ CI ] )
Condit ion Signal Descript ion ( Code Out put Block [ CO] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Relat ional Expression Block [ RL] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Resource Scheduler Block [ RS] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Valve Monit oring Block [ VLVM] )
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 1/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 2/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 3/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Regulat ory Cont rol Block) 4/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 1/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 2/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 3/ 4
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Calculat ion Block) 4/ 4
The t able list s t he calculat ion
blocks t hat can be referenced
in t he condit ion signal as oneshot operat ion.
The form at is:
TAGN AM E.ACT.ON
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Faceplat e Block)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Sequent ial Funct ion Chart Block)
The following list s t he dat a
it em s of SFC block t hat can
describe dat a values in
condit ion specificat ions and
t heir set t ing ranges:
STEPN O:
1 to 99
SW CR[ 5 ] : 0 t o 1 5
SW ST[ 5 ] : 0 ,1
SW OP[ 5 ] : - 1 5 t o 1 5
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Unit Supervision Block)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Processing I / O Block)
Condit ion Signal Descript ion ( Global Swit ch)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Soft ware / Com m on Swit ch)
Condit ion Signal Descript ion ( Com m unicat ion I / O)
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SEQUENCE TABLE BLOCK ( ST16, ST16E)
Condit ion Signal Descript ion ( Annunciat or Message)
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LABORATORY WORKS
Creat e a logic sequence from t hese cont rol narrat ives:
Ca se 1
I n a cascade loop, if t he process variable of t he slave cont roller is HighHigh alarm t hen t he slave cont roller m ode will have t o swit ch t o
CASCADE m ode and t he m ast er cont roller m ode will have t o swit ch t o
AUTO m ode.
However, t he operat or is allowed t o change t he m ode of slave cont roller
t o MANUAL or AUTO m ode even t ough t he process variable is st ill in
High- High alarm st at e.
Ca se 2
I n a cascade loop, if t he process variable of t he slave cont roller is HighHigh alarm t hen t he slave cont roller m ode will have t o swit ch t o
CASCADE m ode and t he m ast er cont roller m ode will have t o swit ch t o
AUTO m ode.
The cont rol m ode of t he slave cont roller cannot be changed unt il t he
alarm vanishes ( process variable is in norm al st at e) .
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Phone : 021-799 0102, Fax : 021-799 0070
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