Omron PLC Center

I hope!,This Omron PLC Programming Document is help you to start ladder programming on you project that we are try provide more resource in PLC ladder,how to build logic for your projects,idea in modify ladder diagram and simulate application, on us web for your study next time.

What is PLC
♦ Programmable Logic Controller
– Limitation by “Logic Controller” Word
– 0&1 Load , And ,Or ,Out
|——-| |—-| |—-( )—|
|——-| |–
♦ Programmable Controller
– Wider open by “Controller” Word
– 0&1 Load,And,Or,Out
– + , - , x , : , Sin , Cos , Tan , (10/3) , > < =

Why PLC need
♦ Ideal system build in Vehicle industrial
– Car Model change frequently
– Complicated control system 100 I/O but
sequence control by 10,000 relay/timer
– System function change need long machine
downtime
– Hardwiring control system difficult for
maintenance and trouble shooting
– Big space require for relay control cabinet

How PLC help
♦ Replace hardware relay/timer/counter by
electronic function
♦ Replace hardwire by software program
♦ System function change by program loaded
♦ Self diagnostic show error and fault in
system
♦ 100 I/O and 10,000 relay/timer in compact
box size

Control system concept
♦ The system which consist of
– Input to command/feedback
– Controller to make decision /process command
– Output to control result

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