MVI94-MCM-MHI | Modbus Master/Slave Communication Module

Product Model **MVI94-MCM-MHI**
Manufacturer Prosoft Technology
Product Type Modbus Master/Slave Communication Module
Compatibility Allen-Bradley ControlLogix (1756 chassis)
Protocol Support Modbus RTU/ASCII/TCP, MHI (Modbus Host Interface)
Communication Ports 2x RS-232/485 (isolated)
Baud Rate 300–115.2 kbps
Power Supply 5 VDC via ControlLogix backplane (85 mA typical)
Operating Temperature -40°C to +70°C
Certifications UL, CE, RoHS, Class I Div 2
Dimensions 135 x 45 x 120 mm (fits single ControlLogix slot)
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Description

Technical Specifications

Product Model **MVI94-MCM-MHI**
Manufacturer Prosoft Technology
Product Type Modbus Master/Slave Communication Module
Compatibility Allen-Bradley ControlLogix (1756 chassis)
Protocol Support Modbus RTU/ASCII/TCP, MHI (Modbus Host Interface)
Communication Ports 2x RS-232/485 (isolated)
Baud Rate 300–115.2 kbps
Power Supply 5 VDC via ControlLogix backplane (85 mA typical)
Operating Temperature -40°C to +70°C
Certifications UL, CE, RoHS, Class I Div 2
Dimensions 135 x 45 x 120 mm (fits single ControlLogix slot)

Key Features and Advantages

The **MVI94-MCM-MHI** enables seamless integration of ControlLogix PLCs with Modbus networks. Its dual-channel design allows simultaneous Master/Slave operation, supporting up to 247 Modbus devices per port. Built-in message queuing optimizes PLC scan times, while galvanic isolation (2,500 Vrms) protects against ground loops. Prosoft’s **Configurator LX™** software simplifies mapping of Modbus registers to ControlLogix tags, with pre-tested AOIs (Add-On Instructions) for rapid deployment.

Dynamic address translation supports both 1-based and 0-based Modbus addressing. The module’s **MHI protocol** enables PLCs to act as Modbus TCP servers for SCADA integration. Ruggedized for harsh environments, it includes surge suppression (IEC 61000-4-5) and conformal coating for humidity resistance.

Application Areas

Industrial automation bridging between ControlLogix and legacy Modbus devices (e.g., meters, drives, HMIs). Water/wastewater treatment plant telemetry, oil & gas RTU communication, and building automation systems. Used for aggregating data from Modbus TCP-enabled IoT sensors into ControlLogix-based SCADA networks.

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Installation and Configuration

**Installation**: Insert into ControlLogix chassis (slot 0-15). Terminate RS-485 networks with 120Ω resistors. Use shielded twisted-pair cables and ground shields at one end. Configure chassis slot addressing via RSLogix 5000/Studio 5000.

**Configuration**: Import AOI library into PLC project. Define Modbus data maps using Configurator LX. For TCP/IP, assign IP via BOOTP/DHCP or static configuration. Test connectivity with built-in diagnostic LEDs (Port Activity, Modbus Error).

Support and Diagnostics

ProSoft provides 24/7 technical support with a 3-year warranty. Onboard diagnostics include packet error counters, CRC failure logs, and slave response timeouts. Use **ProSoft Message Monitor** for real-time protocol analysis. Firmware updates via SD card slot (v3.1+).

Note: Verify Modbus register mapping compatibility with slave devices. For Hazardous Locations, follow ISA 12.12.01 guidelines during installation.

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