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Product Overview
The PROSOFT MVI56-MCM is a Modbus Master/Slave communication module designed for Rockwell Automation ControlLogix systems. It installs in a single ControlLogix chassis slot and provides two configurable serial communication ports for Modbus RTU or Modbus ASCII networks. Each port can operate independently as a Modbus Master or Slave, allowing a ControlLogix processor to exchange data with drives, meters, PLCs, instruments, motor controllers, and other serial devices. ProSoft specifies a 5000-register internal database and up to 100 configurable master commands per port. The module also supports floating-point data movement, including Enron and other common Modbus implementations. This makes it particularly useful when integrating legacy Modbus equipment into a ControlLogix-based automation system.
Technical Specifications — MVI56-MCM
| Parameter | Value |
|---|---|
| Product Model | MVI56-MCM |
| Manufacturer | ProSoft Technology |
| Product Type | Modbus Master/Slave Communication Module |
| Host Platform | Rockwell Automation ControlLogix |
| Modbus Modes | RTU and ASCII |
| Serial Ports | 2 configurable ports |
| Port Function | Master or Slave |
| Communication Interface | RS-232 / RS-422 / RS-485 |
| Baud Rate | 110 to 115.2 kbps |
| Data Size | 7 or 8 bits |
| Stop Bits | 1 or 2 |
| Parity | None, Even, or Odd |
| Master Commands | Up to 100 per port |
| Internal Database | 5000 registers |
| Node Address | 1–247 |
| Floating-Point Support | Enron, Daniel, and other implementations |
| Mounting | Single-slot ControlLogix chassis |
| Power | ControlLogix backplane supplied |
| Typical Interfaces | ControlLogix backplane and serial Modbus ports |
ProSoft documentation confirms the dual-port architecture, 5000-register database, communication parameters, and up to 100 master commands per port.
PROSOFT MVI56-MCM
Key Features and Benefits — MVI56-MCM
- Dual serial ports can be configured independently as Modbus Masters or Slaves.
- Supports both Modbus RTU and ASCII communication.
- Up to 100 master commands can be configured on each active Master port.
- 5000-register memory area provides flexible data exchange between the module and ControlLogix processor.
- Supports floating-point data formats used by various Modbus devices.
- Individual command error codes and port-status information assist troubleshooting.
- Single-slot ControlLogix installation keeps the communication interface within the existing PLC chassis.
Personally, I would check the MVI56-MCM versus MVI56-MCMR distinction before procurement. Although the two modules perform similar Modbus functions, their ControlLogix data mapping and intended remote-chassis applications are different.
Related Models
MVI56E-MCM — Enhanced successor providing the Modbus Master/Slave function with a larger 10,000-word database, Ethernet configuration and diagnostics, while maintaining backward compatibility with earlier MVI56-MCM applications.
MVI56-MCMR — Variant designed for ControlNet remote-chassis applications with reduced I/O data blocks compared with the standard MVI56-MCM.
MVI56-PDPMV1 — ProSoft ControlLogix communication module for PROFIBUS DP-V0/DP-V1 networks rather than Modbus serial networks.
MVI56-MNET — Related ProSoft ControlLogix module for Ethernet-based Modbus TCP communication.
Installation and Maintenance — MVI56-MCM
Before installation, verify the ControlLogix chassis configuration, serial-port mode, baud rate, slave addresses, parity, termination, and RS-232/422/485 wiring. Record the existing module configuration and controller tag mapping before replacement.
During maintenance, inspect the backplane connector, serial ports, cable shielding, termination resistors, and communication status. After installation, confirm each port’s Master/Slave role, command execution, register mapping, error counters, and ControlLogix data exchange. For legacy systems, compare the complete configuration rather than copying only the serial communication settings.
Product Warranty — MVI56-MCM
Warranty coverage depends on supplier condition and sales terms. Confirm whether the module is new, refurbished, repaired, or surplus, and request firmware information, functional-test records, serial-number traceability, and applicable warranty details.
The PROSOFT MVI56-MCM is now maintained within ProSoft’s legacy product portfolio, while the MVI56E-MCM provides an enhanced replacement path for applications requiring additional diagnostics and network-access features.
