A PLC (programmable logic controller) is an industrial digital computer designed for the control of manufacturing processes or robotic devices where reliability control, simple programming and fault diagnosis is necessary. They were originally built to replace electromechanical relay systems in industrial automation.
A CPU (central processing unit) forms part of the PLC system. PLC CPUs are microprocessor-based and act as the electronic circuitry within an industrial computer. They carry out instructions from the computer program, performing basic mathematical, logical, control, input and output operations.
What are PLCs used for?
PLC controllers are important for the correct functioning of machinery in manufacturing and industry. They are used in the automation of electromechanical processes, including control of machinery on assembly lines, amusement rides, or lighting fixtures.
Types of PLCs
Programmable logic controllers are divided into small, medium and large categories. Small control systems are robust, compact and mountable on top of or beside the equipment to be controlled. Medium controllers mainly use rack mounting or backplane systems, allowing for simple upgrading via additional function cards. Large systems are necessary for applications where complex control functions are executed, usually in large plants, in machinery requiring constant monitoring, or control of other PLC hardware.
Description:
Twido programmable controller from Telemecanique providing flexible automation
solutions for the control systems. Designed to be user-friendly and flexible, with powerful control functions. 24 Vdc inputsIsolated outputs100base-TX ethernet via RJ45 (stock no. 528-8643 only)Output rating for relay outputs: 2A@ ...
Description:
Implementing control has been made easy with this
series of logic modules and control relays, valuable time is freed up with the convenient and faster new technology, for power management needs. The number of input/output can be extended easily with ...
Description:
The Zelio Logic SR2/SR3 series by Schneider Electric
provides an alternative to solutions based on cable logic or specific cards. This range is compact, with Modbus or Ethernet communication extension modules compatible with the device. Signal the device remotely, or ...
Description:
The Zelio Logic SR2/SR3 series by Schneider Electric
provides an alternative to solutions based on cable logic or specific cards. This range is compact, with Modbus or Ethernet communication extension modules compatible with the device. Signal the device remotely, or ...