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Modbus TCP/IP Client/Server Enhanced Network Interface Module for ControlLogix


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.

Features and Benefits

Backward Compatibility

  • 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 software (PCB) provides online or offline configuration and diagnostics using high-speed Ethernet port
  • CIPconnect-enabled, allows remote configuration and dignostic 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 Ethernet port provides a web server for local access to documentation, module status, and firmware update software
  • ProSoft Discovery Service, a software utility to locate MVI56E modules on the network and assign a temporary IP address for easy configuration


  • Backward-compatible with previous MVI56-MNET version
  • 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
  • 4-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




Backplane Current Load

  • 800 mA @ 5 V DC
  • 3 mA @ 24V DC

Operating Temperature

  • -25° to 70°C (-13° to 158°F) - MVI56E-MNETXT

 Storage Temperature

  •  -40 to 85°C (-40 to 185°F)


  •  30g Operational
  • 50g non-operational
  • Vibration: 5 g from 10 to 150 Hz

 Relative Humidity

  •  5% to 95% (non-condensing)

 LED Indicators

  •  Battery Status (ERR)
  • Application Status (APP)
  • Module Status (OK)

 4-Character, Scrolling, Alpha-Numeric LED Display

  •  Shows Module, Version, IP, Application Port
  • Setting, Port Status, and Error Information

 Debug/Configuration/Application Ethernet port (E1)

 Ethernet Port

  •  10/100 Base-T, RJ45 Connector, for CAT5 cable
  • Link and Activity LED indicators
  • Auto-crossover cable detection

 Shipped with Unit

  •  5-foot Ethernet straight-through cable


Ex Certificate (ATEX Directive) 108.10 kB Last Modified 05/20/2014
CB Safety 327.83 kB Last Modified 05/20/2014
CE Mark 90.86 kB Last Modified 05/20/2014
Russian GOST-R 1.23 MB Last Modified 11/01/2012
GOST-R Declaration of Conformity 6.68 MB Last Modified 11/01/2012
Korean KC Registration 622.72 kB Last Modified 11/01/2012
Lloyd's Register 2.13 MB Last Modified 11/01/2012
UL/cUL; Class 1, Div 2 1.12 MB Last Modified 05/20/2014
UL/cUL; Class 1, Div 2 (Canada) 1.14 MB Last Modified 05/20/2014