Programmable Logic Controllers

The term "Programmable Logic Controller" refers to an industrial digital computer that can be programmed to control, monitor and automate electromechanical processes in real time (typically) using inputs (sensors, switches), processing those inputs using a user-defined program, and then generating outputs (actuators) in a reliable manner under difficult environmental conditions.

The components of a typical PLC are: a Central Processing Unit (CPU); power supply; input/output (I/O) modules; and various communication interfaces. These components are all designed to give the PLC maximum reliability during continuous operation, so they can provide very accurate and repeatable results. Essentially, PLCs operate as real-time embedded control systems within manufacturing facilities, process industries, infrastructure systems, or in any other type of machine automation application that requires high reliability and accuracy.

The advanced capabilities of today’s PLCs from well-known companies such as Schneider Electric, Siemens, Allen-Bradley, and ABB that provide high-speed performance, Ethernet communication, remote control, motion control, data management and compatibility with SCADA / HMI systems.

PLCs serve a wide variety of industrial applications including packaging machinery; wastewater treatment plants; electric utilities; textile equipment; food and beverage processing; materials handling; and smart factories. Their modular construction, flexibility to program, ease of troubleshooting, and extended life expectancies provide automated solutions that are both affordable and ready for the future for all types of manufacturers, regardless of size.