What Is PLC Programming?

by Bimlendu Roy

PLC is an acronym for Programmable Logic Controller. The PLC takes the input, checks the condition and, based on the condition, switches its output on or off.


PLC is used in most of the industries where electrical control is required to perform certain industrial tasks, such as packaging, automated assembly and material handling.


PLC was pioneered in the late 1960s, primarily to get rid of relay-based machines or mechanical devices.


PLC is made up of a Central Processing Unit (or CPU), memory and input/output circuits. Furthermore, PLC contains counters, timers, relays and memory locations.


Relays acquire or transmit signals from switches and sensors. Counters are used for counting electrical pulses.


There are three functional steps in the PLC: checking input status, executing a program and updating output status.

About the Author

Bimlendu Roy began freelance writing in 2009 but has extensive experience as a business analyst and developer. He has created online content for websites including eHow and WordPress. Roy holds a master's degree in business administration from Johnson & Wales University.