Our Commitment to You During COVID-19 Click here
MVI69-Serial Picture

DF1 Master/Slave Network Interface Module for CompactLogix


Discontinued: No new product for sale. More Info
Recommended replacements: PLX51-DF1-ENI

Check here to learn more about our Legacy Product Replacement Plan

The MVI69-DFCM DF1 Master/Slave Communication Module allows Rockwell Automation CompactLogix / MicroLogix compatible processors to interface easily with DF1 protocol compatible devices and hosts. Devices commonly supporting the protocol include Rockwell Automation PLCs and power monitoring equipment, as well as several other third party devices in the marketplace.

The MVI69-DFCM module has two Application Serial ports supporting the DF1 protocol, with each port user-configurable to act as a Master or as a slave. Data transfer between the module and the CompactLogix / MicroLogix processor is asynchronous to the DF1 network, with the module’s internal database being used to exchange data between the processor and the DF1 network.

Features and Benefits

  • Single-slot, 1769 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 memory and processor controller tags. A sample ladder file with AOI is included.
  • Configuration data obtained from configuration text file downloaded to module. A sample configuration file is included.
  • Supports CompactLogix and MicroLogix 1500 LRP Controllers except 1769-L23E-QBFC1B, 1769-L16x, and 1769-L18x.


Functional Specifications

DF1 ports

  • Full and half duplex modes supported
  • CRC and BCC error checking
  • Full hardware handshaking control provides radio, modem and multi-drop support
  • User-definable module memory usage, supporting the storage and transfer of up to 4000 registers to/from the control processor
  • 125-word read and write command lengths supported
  • Floating-point data movement supported

DF1 Master Protocol Specifications

The ports on the DF1 module can be individually configured as Master ports. When configured in Master mode, the DFCM module is capable of reading and writing data to remote DF1 devices, enabling the CompactLogix/MicroLogix platform to act as a SCADA sub-master.

  • Command List: Up to 100 commands per Master port, each fully configurable for function, slave address, register to/from addressing and word/byte count
  • Status Data: Error codes available on an individual command basis. In addition, a slave status list is maintained per active Master port
  • Polling of Command List: User-configurable polling of commands, including disabled, continuous, and on change of data (write only)

DF1 Slave Protocol Specifications

The module accepts DF1 commands from an attached DF1 Master unit. When in slave mode, the module can accept DF1 commands from a Master to read/write data stored in the module’s internal registers. This data can be derived from other DF1 slave devices on the network through a Master port or from the processor and is easily transferred to the processor’s data registers.

Tested Hardware Connections

Several hardware connections have been tested by ProSoft or have been customer field tested. The following physical connections have been tested successfully:

  • RA Panel View (Full duplex point-to-point, DFCM as slave)
  • RA Processors (Full/half duplex, DFCM as either Master or slave)
  • RA Power Monitors (485 half-duplex, DFCM as Master)





Standard 1769 Single-slot module

Current Load

800 mA max @ 5 VDC
Power supply distance rating of 2 (L43 and L45 installations on first 2 slots of 1769 bus)

Operating Temp.

32° F to 140° F (0° C to 60° C)

Storage Temp.

-40° F to 185° F (-40° C to 85° C)

Relative Humidity

5% to 95% (without condensation)

LED Indicators

Battery and Module Status

Application Status

Serial Port Activity

CFG Port Activity

CFG Port (CFG)

RJ45 (DB-9F with supplied cable)

RS-232 only

No hardware handshaking

App Ports (P1,P2) (Serial modules)

RS-232, RS-485 or RS-422 (jumper selectable)

RJ45 (DB-9F 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


Ex Certificate (ATEX Directive) 83.59 kB Last Modified 11/22/2019
CB Safety 347.28 kB Last Modified 02/26/2020
Declaration of Conformity (RoHS/CE) 301.13 kB Last Modified 03/04/2018
Country Approval - Russia - EAC Declaration (Wired) 1.92 MB Last Modified 01/07/2020
Korean KC Registration 589.17 kB Last Modified 03/13/2020
UL/cUL; Class 1, Div 2 (Canada) 1.14 MB Last Modified 02/27/2019
UL/cUL; Class 1, Div 2 232.99 kB Last Modified 04/08/2019