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Modbus TCP/IP Client/Server Enhanced Communication Module

The MVI56E Modbus TCP/IP Client/Server Enhanced Communication Module allows Rockwell
Automation ControlLogix processors to interface easily with Modicon Programmable Automation
Controllers (PACs) and a wide variety of Modbus TCP/IP-compatible instruments and devices.

MVI56E enhancements include local and remote configuration and diagnostics through the
module’s Ethernet port, CIPconnect technology for bridging though Rockwell Automation
ControlNet and EtherNetIP networks, and an on-board web server for access to module
documentation and sample program files.

The MVI56E-MNET and MVI56E-MNETXT are functionally the same. The MVI56E-MNET is
designed for standard process applications. The MVI56E-MNETXT is designed for the Logix-XT
control platform, allowing it to operate in extreme environments, at higher operating temperatures,
and has a conformal coating to protect it from harsh or caustic conditions.




-Upgrade earlier MVI56-MNET modules without changing existing ladder logic programs or module configurations
-Enhanced features and flexibility without incurring expensive reprogramming costs

For Extreme Environments
(MVI56E-MNETXT only)

-Conforms to the EN60079-0 and EN60079-15 standards for applications in caustic and extreme temperature environments
- Operates in temperature extremes from -25° to 70° C (-13° to 158° F)
-Conformal coating protects against caustic or corrosive environmental elements

RSLogix 5000 Integrated

-Module communication is integrated within RSLogix 5000 using a sample Add-On Instruction (AOI) or sample ladder logic file

Graphical User Interface Software

-ProSoft Configuration Builder (PCB) provides online or offline configuration and diagnostics using the high-speed Ethernet port
-CIPconnect-enabled, allows remote configuration and diagnostic access across multiple, bridged EtherNet/IP and ControlNet networks using Rockwell Automation 1756-ENxT and 1756-CNB network interface modules

Web-enabled Ethernet port with
Discovery Service

-Module’s built-in Ethernet port provides a Web server for local access to documentation,
module status, and firmware updates
-Includes ProSoft Discovery Service, a software utility to locate MVI56E modules on the network and assign them temporary IP addresses for easy configurationBadger@69

MVI56E General Specifications

  • Backward compatible with previous MVI56-MNET versions
  • Single-Slot 1756 ControlLogix backplane compatible
  • 10/100 Mbps auto crossover detection Ethernet configuration and application port
  • User-definable module data memory mapping of up to 5000, 16-bit registers
  • CIPconnect-enabled network configuration and diagnostics monitoring using ControlLogix 1756-ENxT and 1756-CNB modules and EtherNet/IP pass-through communication
  • ProSoft Configuration Builder (PCB) software supported, a Windows-based graphical user interface providing simple product and network configuration
  • Sample ladder logic and Add-On Instructions (AOI) are used for data transfer between module and processor
  • Internal web server provides access to product documentation, module status, diagnostics, and firmware updates
  • Four-character, alpha-numeric, scrolling LED display of status and diagnostics data in plain English – no cryptic error or alarm codes to decipher
  • ProSoft Discovery Service (PDS) software used to locate the module on the network and assign temporary IP address
  • Personality Module - a non-volatile industrial-grade Compact Flash (CF)card used to store network and module configuration, allowing quick in-the-field product replacement by transferring the CF card

Modbus TCP/IP Specifications

ProSoft Technology’s Modbus TCP/IP implementation (MNET) includes both Client (Master) and server (slave) capabilities. Modbus data types overlap in the module's memory database, so the same data can be conveniently read or written as bit-level or register-level data. Configurable floating point data movement is possible, including support for Enron or Daniel® floating point formats.

Modbus TCP/IP Server (Slave)

  • Supports five independent server connections for Service Port 502 (MBAP)
  • Supports five independent server connections for Service Port 2000 (Encapsulated)
  • Accepts Modbus Function Codes 1, 2, 3, 4, 5, 6, 8, 15, 16, 17, 22 and 23
  • Module data can be derived from other Modbus server devices on the network through the Client or from the ControlLogix processor

Modbus TCP/IP Client (Master)

  • Actively reads data from and writes data to Modbus TCP/IP devices, using MBAP or Encapsulated Modbus message formats
  • Transmit Modbus Function Codes 1, 2, 3, 4, 5, 6, 7, 15, and 16
  • Offers one Client connection with up to 100 commands to talk to multiple severs
  • ControlLogix processor can be programmed to use special functions to control the activity on the Client by actively selecting commands to execute from the command list (Command Control) or issuing commands from ladder logic(Event Commands)

Status Data

  • Error codes, counters, and module status available from module memory through the Server, through the Client, or through the ladder logic and controller tags in RSLogix 5000

Functional Specifications

  • The MVI56E-MNETand MVI56E-MNETXT are functionally identical. The MVI56E-MNET is for normal process and control environments. The MVI56E-MNETXT is conformal coated for extra protection in harsh or caustic environments and operates in extreme high or low temperature environments.
  • Both modules transfer data in the largest possible I/O image block sizes, which optimizes data through-put and update time.
  • Both modules appear to the ControlLogix processor as input/output (I/O) module, rather than communication modules.
  • Both modules work well in local rack applications and may be used in remote rack applications (For information on a remote rack optimized, reduced data block version of the inRAx MNET module, look for the MVI56E-MNETR).
  • Retrieving module status and executing special functions (command control, event commands, etc.) are supported in ladder logic by special block transfer codes

Hardware Specifications



Backplane Current Load

800 mA @ 5 Vdc

3 mA @ 24 Vdc

Operating Temperature

0°C to 60°C (32°F to 140°F) all models except XT

-25°C to 70°C (-13°F to 158°F) all XT models

Storage Temperature

-40°C to 85°C (-40°F to 18°F)


30g Operational
50g non-operational


5g, 10 Hz to 150 Hz

Relative Humidity

Up to 95% RH, with no condensation

4-character alphanumeric LED Indicator:

Plain English display of:

  • Module Status
  • Application Status

Baud Rate

10 Mbit/s

Ethernet Port

10/100 Base-T

RJ45 Connector

Link and activity LED indicators

Electrical Isolation 1500 V rms at 50 Hz to 60 Hz for 60s, applied as specified in section 5.3.2 of IEC 60950: 1991

Ethernet Broadcast Storm Resiliency = less than or equal to 5000 [ARP]frames-per-second and less than or equal to 5 minutes duration

Conformal Coating

Included on all XT modules; optional on all other modules


Training Video


Image Gallery




Add-On Instruction How-To

EDS File

ProSoft Discovery Service

Sample Ladder

Optional Add-On Instruction (Adds Features to Main)

Add-On Instruction (AOI) (Main Functions)

Setup Guide

User Manual


Related Information

ProSoft Configuration Builder

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