Allen-Bradley MVI56E-MCMR | ControlLogix Enhanced Modbus Interface Module

Overview

The MVI56E-MCMR from Allen-Bradley is a ControlLogix enhanced Modbus master/slave communications interface module. It supports reduced data blocks and integrates seamlessly with 1756 chassis.

Communication Interfaces

This module includes one RJ45 configuration port and two serial application ports, supporting RS232, RS485, and RS422 standards. Ethernet transmission operates at 10/100 Mbps, while serial communication supports 110 baud up to 115.2 kbps.

MODBUS Functionality

The MVI56E-MCMR performs both Modbus master and slave operations. It supports up to 100 commands per master port and node addresses ranging from 1 to 247, enabling flexible industrial network configurations.

Data and Processing

This interface module handles up to 5,000 words of data and integrates with ladder logic programs. It provides configurable serial parameters including parity, data bits, stop bits, and RTS delay for precise communication control.

LED Indicators and Diagnostics

Module status, battery status, and application indicators provide clear visual feedback. Green LEDs illuminate to indicate operational status, while flashing LEDs signify active communication.

Electrical and Physical Specifications

The MVI56E-MCMR requires 800 mA at 5 V DC from the ControlLogix backplane. It occupies a single slot and mounts in standard 1756 racks. Operational temperature ranges from 0°C to 60°C, with storage support from -40°C to 85°C. Shock tolerance reaches 30 g, and relative humidity is supported from 5% to 95% without condensation.

Applications

This Allen-Bradley module is ideal for industrial automation requiring reliable Modbus communication. It connects easily to HMI, SCADA, and control systems while supporting multiple network topologies with both Ethernet and serial interfaces.