2.3 Types of Connection
There are few types of connection available for the CQM1H-CPU21 Programmable Logical Controller; they are host link connection which using RS232C cable, DeviceNet,
Controller Link, and Ethernet.
Among these four types of connection, RS232C provide lowest budget option, followed by Ehternet, DeviceNet and Controller Link. This is because we can just simply
purchase the RS232C connector, also known as 9 pin D-sub connector and make own cable by following the OMRON operational manual under wiring section [3-5] . The function of
RS232C connection is almost the same compare with Ethernet, DeviceNet, and Controller Link connection.
From the data transmit aspect, DeviceNet and Controller Link connection possesses better solution, this is because they no need any additional program in order to show their
data on the screen. This can be done by just purchase DeviceNet cable and Controller Link unit with installed software, and then the data can be seen without any extra interface
needed. Method to operate the DeviceNet can be obtain in its manual[6] .Whereby, Controller Link Unit is another additional plug in for CQM1H-CPU21 Programmable
Logical Controller, this Controller Link Unit are used to transmit data in big quantity, but it still need an software interface created by user [7] . For Ethernet connection, it can conduct
function as excellent as Control Link Unit, but we need to purchase OMRON FINS Ethernet Communication Interface API, the price of this will cost 395.00 U.S. Dollar
[8] . And this is over my range of budget for this project.
From the above comparison, it is obvious that connection type of RS232C will provide more economical solution, since the budget is biggest concern in this project, so, at
this part, I will choose RS232C host link communication as connection type between CQM1H-CPU21 PLC and my laptop. Table 2.2 shows the specifications of each type
connections:
Table 2.2: Comparison of Types of Connections Topic
RS232C DeviceNet
Ethernet Controller Link
Unit Ease
Need to build own cable
[3] . Able to
purchase in whole set.
Able purchase in
whole set. Able to purchase
in whole set.
Cost Cheapest
since can custom made
according to operational
manual [3] . Expensive,
need purchase
software and DeviceNet
controller card.
Expensive, need
purchase cable from
detailer. Expensive, need
purchase software and
Controller Link Unit controller
card.
2.4 Type of header
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