PLC Input & Output Module

PLC Programming

Input Module

The input module has two functions:

1. Reception of an external signal
2. Status display of that input point

It receives the peripheral sensing unit's signal and provides signal conditioning, termination, isolation and/or indication for that signal's state. The input to an input module is in either a discrete or analog form.

Output Module

The output module serves following functions:

1. Transmits discrete or analog signals to activate various devices like hydraulic actuators, solenoids, motor starters
2. Displays the status (through the use of LEDs) of the connected output points
3. Signal conditioning
4. Termination
5. Isolation

The output module is treated in the same way as the input module by the processor.

PLC Main Features