The MVI56E-MCM sits in a ControlLogix chassis slot and maps Modbus register data directly into the PLC’s tag database via backplane DMA, eliminating the inter-device polling latency of external serial servers. Two independent serial ports each support up to 247 Modbus slave devices, connecting 494 legacy instruments to a single ControlLogix processor. ProSoft Configuration Builder software generates ladder logic rungs and tag definitions automatically, reducing integration time from days to hours. Ethernet configuration port provides web-based diagnostics showing live Modbus transaction logs, error counts, and register values for commissioning. Compatible with ControlLogix 5580, 5570, 5560, and 5550 processors in standard and redundancy configurations.