PLCs
What is Expansion Module?
Definition
An add-on hardware module that increases the I/O count, communication capabilities, or functionality of a PLC system. Expansion modules connect to the CPU via a backplane bus and allow flexible system scaling.
Related Terms
I/O Module
An input/output module that connects field sensors and actuators to a PLC or con...
PLC (Programmable Logic Controller)
A ruggedized digital computer used to automate industrial processes by reading i...
CPU Module
The central processing unit of a PLC system that executes the control program, m...
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