PLC - Programmable Logic Controller
Programmable Logic Controllers are microprocessor-based devices used to control industrial processes or machines. They are widely used in the field of industrial automation control. The system works by monitoring the state of input devices and make decisions based upon a custom program to control the state of output devices.
PLC - Public Limited Company
A Public Limited Company is a kind of public company which has offered shares to the general public. These shares can be aquired by anyone and in case of any mishap, the share holders will only loose the amount that they have paid. It is a legal form, more commonly used in the the United Kingdom, some Commonwealth jurisdictions, and the Republic of Ireland.