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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.
Also in the interest of how PLCs work, you may like to see the PLC History or the Smallest PLC pages on this website. Or maybe you would like to register for our self teach PLC programming course which is in the making.he CPU-Central Processing Unit. How PLCs work is down to the CPU, the CPU is the PLC part which is the brain of the whole PLC. This module typically lives in the slot beside the power supply or is incorporated with a power supply.