The ABB 520CMD01 communication unit (CMU) is the brain of the RTU520 product line, a Remote Terminal Unit. It’s responsible for managing and controlling I/O modules, communicating with control centers, and running application software.

Here’s a summary of its key functionalities:

• Manages and controls I/O modules via the serial I/O bus.
• Reads process events from input modules.
• Sends commands to output modules.
• Communicates with control systems and local HMI systems via serial interfaces (RS232) and the Ethernet 10/100BaseT interface.

The 520CMD01 offers various communication ports:

• Communication Port 1 (CP1): a serial interface according to RS232C with RJ45 connector.
• Communication Port 2 and 3 (CP2 & CP3): serial interfaces according to RS485 with RJ45 connector.
• Ethernet interface (E1): 10/100BaseT with RJ45 connector.

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