INDUSTRIAL COMMUNICATION ProSoft MVI56-MCM Modbus Master/Slave Communication Module ControlLogix in-chassis serial communication interface for Modbus RTU and Modbus ASCII networks. ControlLogix Modbus Connectivity The MVI56-MCM provides the communication path between a ControlLogix processor and Modbus-compatible equipment, with module data exchanged through the ControlLogix backplane and the serial network. Technical Specifications Core Module & ControlLogix Specifications