One reason for the popularity of PLCs is their high reliability in harsh industrial environments occasionally, however, things do go wrong and troubleshooting becomes necessary. The PLC reads inputs, processes them through a program, and generates outputs. ![]() I/O modules connected to the PLC provide analog or digital electronic interfaces to the external world. These functions usually are used to monitor and control individual machines or complex processes via inputs and outputs (I/Os). Those instructions enable the PLC to perform various useful control functions like relay logic, counting, timing, sequencing, and arithmetic computation. What is a PLC? In brief terms, a PLC is a digital electronic device that contains a programmable (changeable) memory in which a sequence of instructions is stored. Because they have constantly increased in capability while decreasing in cost, PLCs have solidified their position as the device of choice for a wide variety of control tasks. Programmable logic controllers (PLCs) have become important building blocks for automated systems.
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