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Modbus Serial Lite Communication Module for CompactLogix


The MVI69L-MBS, Modbus Serial module for the CompactLogix™ series of controllers is designed for smaller applications where communication between a few Modbus Serial devices is required. This module has an Add-on Profile and an Add-on Instruction to reduce commissioning time. The MVI69L-MBS has a single serial port and can support either Master or Slave connectivity to interface with a variety of devices using the Modbus Protocol.


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Features and Benefits

  • Supports CompactLogix processors with 1769 I/O bus capability version 16 and greater (MicroLogix 1500 not supported)
  • Add-on Instruction creates UDTs, providing logical definitions for I/O, status, and control data
  • Add-on Profile support, improving integration in the CompactLogix System
  • Diagnostic data available in processor controller tags, enabling decisions to be made based upon node health
  • Module configuration backed up in CompactLogix project (ACD file)
  • Module acts as a co-processor reducing impact to PLC scan time
  • Supports up to 240 words of I/O data
  • Application port can be configured as either a Modbus Master or Modbus Slave
  • Supports up to 30 Modbus Commands as a Modbus Master
  • Supports Enron and Daniel style Floating point data implementations
  • Most suitable for OEM and Machine Builder applications



ProSoft Configuration Builder

I/O Size

240/240 - 16 bit integers


Baud Rate: 110 to 115K baudStop Bits: 1 or 2Data Size: 7 or 8 bitsParity: None, Even, OddRTS Timing delays: 0 to 65535 milliseconds

Modbus Modes

RTU mode (binary) with CRC-16
ASCII mode with LRC error checking

Floating Point 

Floating point data movement supported, including configurable support for Enron, Daniel®, and other implementations

Modbus Function
Codes Supported

1: Read Coil Status
2: Read Input Status
3: Read Holding Registers
4: Read Input Registers
5: Force (Write) Single Coil
6: Preset (Write) Single Holding Register
8: Diagnostics (Slave Only, Responds
 to Sub function 00)

15: Force (Write) Multiple Coils
16: Preset (Write) Multiple Holding Registers
17: Report Slave ID (Slave Only)
22: Mask Write Holding Register (Slave Only)
23: Read/Write Holding Registers (Slave Only)





Standard 1769 Single-slot module

Current Load

450 mA max @ 5 VDC
Power supply distance rating of 4

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% (with no condensation)

LED Indicators

OK - Module Status
ETH - Ethernet Communication
P1 - Serial Communication
BP - Backplane Connectivity
CFG - Valid Configuration

Debug Port

10/100 Ethernet Port

Apps Port

RS-232, RS-485 or RS-422
RJ45 (DB-9F with supplied cable)
RS-232 handshaking configurable
500V Optical isolation from backplane

Shipped with Unit

1 - RJ45 to DB-9M cables for application port
1 - DB-9F breakout boards
1 - 6 foot Ethernet Cable


Ex Certificate (ATEX Directive) 83.62 kB Last Modified 02/25/2016
CB Safety 344.71 kB Last Modified 05/20/2014
Declaration of Conformity (RoHS/CE) 300.67 kB Last Modified 03/04/2018
CE Mark 92.17 kB Last Modified 02/22/2013
Korean KC Registration 716.91 kB Last Modified 05/06/2013
UL/cUL; Class 1, Div. 2 46.68 kB Last Modified 03/18/2013