Communication modules connect a PLC to other devices via Ethernet, RS-232/485, CANbus or PROFIBUS.
I/O modules extend the number of I/O channels controlled by the PLC.
If the I/O modules are connected externally, an adapter (EX-A2X or URB-TCP) is always required first, to which up to 8x remote or 63x Ethernet I/O modules can then be connected.
Only the large-format Vision PLCs from 5" display upwards are equipped with 1x snap-in I/O module on the rear.
For the modular 7", 10" or 15" UniStream PLC, the Uni-IO modules are used, which are either plugged directly onto the rear of the PLC or mounted on a remote DIN rail using the extension kits in the accessories (UAG-xxxx).