MVI56-Serial Picture

'C' Programmable Application Development Module for ControlLogix


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The MVI56 Application Development Module is a ControlLogix backplane compatible module that allows user-developed 'C' applications to operate on the ControlLogix platform. A great way to speed up custom ASCII data communications or to protect a proprietary algorithm, the ADM is a powerful tool for the ControlLogix platform.

Features and Benefits

Powerful platform for developing and running 'C' applications on Rockwell Automation's ControlLogix processors. The MVI56-ADM module is a single slot, backplane compatible solution for the Rockwell Automation ControlLogix platform. This module is a powerful and programmable solution supporting two fully isolated serial ports allowing the many serial field devices to be integrated into the ControlLogix platform.

PRT1 and PRT2 are jumper configured for direct or Multidrop field communication. The application program can be written to control the two application ports independently, allowing maximum flexibility in the design.


The MVI56-ADM module is the ideal solution for many applications where serial connectivity must be added to a ControlLogix platform. Applications using the MVI56-ADM module include:

  • Bar code scanner interface
  • Legacy ASCII protocol connections
  • Terminal port emulation
  • Printer driver (alarm/status printer)
  • Customized protocol implementations


  • Single Slot - 1756 backplane compatible
  • The module is recognized as an Input/Output module and has access to processor memory for data transfer between processor and module
  • 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.
  • Local or remote rack.

Development Environment

  • Operating system: General software DOS 6-XL
  •  Compatible compiler (16-bit DOS target)
    • Digital Mars C++ V8.49 (included)
    • Borland C++ V5.02

Application Programming Interfaces (API)

  • Serial Port API: serial port functions
  • Backplane API: low level backplane functions
  • ADM API debug port functions: debug port functions, database functions, timer functions, high level backplane transfer functions, LED functions, flash read functions




Backplane Current Load

800 mA @ 5.1 VDC
3 mA @ 24 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


5 g from 10 to 150 Hz

Relative Humidity

5% to 95% (without condensation)

LED Indicators

Module Status
Backplane Transfer Status
Application Status
Serial Activity

Debug/Configuration port (CFG)

CFG Port (CFG)

RJ45 (DB-9M with supplied cable)
RS-232 only

Application ports (PRT1 & PRT2)

Full hardware handshaking control, providing radio, modem and multi-drop support

Software configurable communication parameters

Baud rate: 110 to 115,200 baud, depending on protocol

RS-232, 485 and 422

Parity: none, odd or even

Data bits: 5, 6, 7, or 8

Stop bits: 1 or 2

RTS on/off delay: 0 to 65535 milliseconds

App Ports (P1,P2) (Serial modules)

RJ45 (DB-9M with supplied cable)

RS-232 handshaking configurable

500 V Optical isolation from backplane

Shipped with Unit

RJ45 to DB-9M cables for each port

6-foot RS-232 configuration cable


ATEX Letter of Conformity 79.81 kB Last Modified 05/12/2022
CB Safety 41.99 kB Last Modified 02/26/2020
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Korean KC Registration 616.34 kB Last Modified 03/13/2020
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