Communication module for Modicon M171 / M172 PLC controllers. Expands the controller with an interface for Ethernet / Modbus TCP / BACnet IP (B-AAC profile), which can also be used for WebVisu and remote download functions. Connection via an RJ45 socket. Each controller can be expanded with a communication module. The connection is made by snapping it into place on the left side of the controller. The power supply is provided by the PLC controller. Mounted on a 35mm top hat rail.