ProSoft MVI56E-MCMXT Modbus Communication Module

ProSoft MVI56E-MCMXT is an in-chassis Modbus communication module for ControlLogix and Logix-XT platforms. The module provides serial Modbus connectivity between Logix controllers and Modbus devices, supporting Modbus RTU and Modbus ASCII protocols through two configurable serial ports. Its XT-version design includes conformal coating for applications requiring enhanced environmental protection.

Modbus Communication Gateway

The MVI56E-MCMXT acts as an interface between the ControlLogix processor and Modbus serial networks. It exchanges data between Logix controller memory and connected Modbus devices through an internal shared database.

Each serial port can be configured independently, allowing the module to operate as a Modbus Master, Modbus Slave, or a combination of both across the two communication channels.

Serial Interface Capabilities

The module provides two isolated serial communication ports with flexible interface selection.

Supported serial standards include:

• RS-232

• RS-422

• RS-485

The isolated RJ45 serial ports help simplify integration with a wide range of Modbus-compatible devices, including drives, meters, RTUs, analyzers, and third-party control equipment.

Protocol Configuration

The MVI56E-MCMXT supports both major Modbus serial protocol formats.

Available communication options include:

• Modbus RTU

• Modbus ASCII

• Master mode operation

• Slave mode operation

• Mixed Master/Slave configurations

Serial communication parameters are user-configurable for integration with existing field devices.

Internal Database

The module includes an internal shared database of 10,000 registers (16-bit words).

This memory area is used for data exchange between the ControlLogix controller and the Modbus network, allowing process data, status information, and control values to be transferred efficiently between systems.

Diagnostics and Status Monitoring

Diagnostic and operational status information is available through onboard indicators and the dedicated Ethernet debug interface.

LED indicators include:

• Battery Status

• Module Status

• User Status

• Serial Activity TX/RX

• Ethernet Activity

A 10/100 Mbps Ethernet RJ45 debug port is provided for module configuration, diagnostics, and troubleshooting functions.

Environmental Characteristics

The XT version is designed for installation in demanding industrial environments.

The module includes standard conformal coating and supports operation across a wide ambient temperature range while maintaining compatibility with ControlLogix and Logix-XT chassis installations.

Technical Specifications

Installation Considerations

The MVI56E-MCMXT occupies a slot within a ControlLogix or Logix-XT chassis and draws power directly from the backplane. When configuring a system, the module's backplane current requirements should be included in chassis power supply calculations.

The selected serial interface, protocol mode, baud rate, and data format must match the connected Modbus devices to ensure proper communication.

Frequently Asked Questions

Q: Can the MVI56E-MCMXT operate as both a Modbus Master and Slave?

A: Yes. The module supports Master mode, Slave mode, and mixed Master/Slave configurations across its two serial communication ports.

Q: How much shared data memory is available between the Logix controller and Modbus devices?

A: The module provides an internal database of 10,000 registers (16-bit words) for exchanging data between the controller and the Modbus network.

Q: What serial communication standards are supported?

A: The module supports RS-232, RS-422, and RS-485 communication through two isolated serial ports configurable for Modbus RTU or Modbus ASCII operation.