MVI46-Serial Picture

Modbus Master/Slave Network Interface Module for SLC


Discontinued: No new product for sale. More Info
Recommended replacements: PLX31-EIP-MBS4

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The MVI46 Modbus Master/Slave Network Interface Module allows Rockwell Automation SLC processors to interface with Modbus-compatible devices. Compatible devices include not only Modicon PLCs but also a wide assortment of third-party devices found in nearly every industry.

Features and Benefits

The inRAx Modbus Master/Slave Communications module is designed to allow SLC processors to interface easily with Modbus protocol-compatible devices and hosts.

The MVI46-MCM module acts as an input/output module between the Modbus network and the Rockwell Automation backplane. The data transfer from the SLC processor is asynchronous from the actions on the Modbus network. A 5000-word register space in the module exchanges data between the processor and the Modbus network.

Many host SCADA packages support the Modbus protocol, while devices commonly supporting the protocol include several PLCs, as well as many other third party devices in the marketplace. (For a partial list of devices that speak Modbus, please visit the ProSoft Tested section of the ProSoft Technology web site).


Applications using the Modbus Communication Module can be found in many industrial sectors and in the following applications:

  • Foreign device data concentrator
  • Pipelines and offshore platforms
  • Food processing
  • Mining
  • Pulp and paper
  • SCADA communications


  •  Single Slot - 1746 backplane compatible (Local or extended I/O rack only. Remote rack not supported)
  •  The module is recognized as an Input/Output module and has access to processor memory for data transfer between processor and module using M0/M1 files
  •  Ladder Logic is used for data transfer between module and processor. Sample ladder file included
  •  Configuration data obtained from configuration text file downloaded to module. Sample configuration file included 




Backplane Current Load

800 mA @ 5.1 VDC

Operating Temperature

32° F to 140° F (0° C to 60° C)

Storage Temperature

-40° F to 185° F (-40° C to 85° C)


30 g operational
50 g non-operational

Relative Humidity

5% to 95% (without condensation)


5 g from 10 to 150 Hz


Compatible with Rockwell Automation SLC 5/02 M0/M1 capable processors or newer

LED indicators

Module status, Backplane transfer status, Application status, Serial activity and error LED status

Debug/Configuration port (CFG)

CFG Port (CFG)

RJ45 (DB-9M with supplied cable)

RS-232 only

Configuration Connector

RJ45 RS‑232 Connector (RJ45 to DB-9 cable shipped with unit)

Application Ports

Application Serial port (PRT1, PRT2) (Serial Modules)

Two RJ45 RS-232/422/485 Application ports


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