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A programmable logic controller, PLC, or programmable controller is a digital computer used for automation of typically industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures.PLCs are used in many machines, in many industries.pecial-purpose I/O modules may be used where the scan time of the PLC is too long to allow predictable performance. Precision timing modules, or counter modules for use with shaft encoders, are used where the scan time would be too long to reliably count pulses or detect the sense of rotation of an encoder.
When you upload the Structured Text PLC program to your PLC, the programming software you use will compile your program. This means that it will translate the code to a sort of machine code which can be executed by the PLC. The compiler uses the syntax of the programming language to understand your program.tructured Text is PLC programming language defined by PLCOpen in IEC 61131-3. The programming language is text-based, compared to the graphics-based ladder diagram. At first, it may seem better to use a graphical programming language for PLC programming. But in my opinion, that is only true for smaller PLC programs.