Different Types of Communication Bus in PLC

Buses are the paths through which the digital signal flows internally of the PLC.

The four system buses are:

Data bus

It is used by the CPU to transfer data among different elements.

Control bus

It transfers signals related to the action that are controlled internally.

Address bus

It sends the location’s addresses to access the data.

System bus

It helps the I/O port and I/O unit to communicate with each other

Note: Depends on PLC manufacturer, the terminology may change.

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