PLC

A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program, to control the state of devices connected as outputs.

Almost any production line, machine function or process can be automated using a PLC. The speed and accuracy of the operation can be greatly enhanced using this type of control system. But the biggest benefit in using a PLC is the ability to change and replicate the operation or process while collecting and communicating vital information.

A PLC consists of following main parts:



What is a PLC input/output?

INPUT
OUTPUT
Sensing Devices
Valves
Switches and Pushbuttons
Solenoids
Proximity Sensors
Motor
Limit Switches
Actuators
Pressure Switches
Pumps

PLC Operations consist of four steps

1. Input Scan: Scans the state of the Inputs
2. Program Scan: Executes the program logic
3. Output Scan: Energize/de-energize the outputs
4. Housekeeping














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