Programmable Logic Controller(PLC) is an electronics device which is used for automation purpose's.in industry PLC is used for automation purpose's such as control of machinery.in comparison to general purpose computer's PLC has various advantages like immunity to noise,less effect of vibration,can work in dusty conditions and extended temperature range.

Uses of PLC:
1.pipeline automation of oil,gas,water.
2.Electric traction.
3.Power transaction.
4.traffic control etc...