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Modbus Serial Enhanced Communication Module


The MVI69E-MBS Modbus Serial module for CompactLogix™ is designed for all applications requiring Modbus Serial connectivity. This module comes with an Add-on Profile and an Add-on Instruction to reduce commissioning time. The MVI69E-MBS has two serial ports and can support both Master and/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 10,000 words of data
  • Supports up to 250 Modbus Commands per port
  • Each port can be configured individually as a Modbus Master or Modbus Slave device
  • Supports Enron and Daniel-style Floating point data implementations
  • Suitable for SCADA and field device interface applications



ProSoft Configuration Builder

I/O Size

60/120/240 - 16 bit integers


Baud Rate: 110 to 115K baud
Stop Bits: 1 or 2
Data size: 7 or 8 Bits
Parity: None, Even, Odd
RTS Timing delays: O 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)

Modbus Master

A port configured as a Modbus Master actively issues Modbus commands to other nodes on the Modbus network.

Command List

Up to 250 command per Master port, each fully configurable for function, slave address, register to/from addressing and word/bit count.

Polling of command list

Configurable polling of command list, including continuous and on change of state.

Status Data

Error codes available on an individual command basis. A slave status list is maintained per active Modbus Master port.

Modbus Slave

A port configured as a Modbus Slave acts as a node and permits a remote Master to interact with all data contained in the module.

Node Address

1 to 247 (software selectable)

Status Data

Error codes, counters and port status available per configured slave port





Standard 1769 Single-slot module

Current Load

500 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 - Port 1 Serial Communication
P2 - Port 2 Serial Communication
BP - Backplane Connectivity
CFG - Valid Configuration

Debug Port

10/100 Ethernet Port (auto-negotiating)

App Ports (P1,P2)

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

2 - RJ45 to DB-9M cables for application ports
2 - DB-9F breakout boards


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
Korean KC Registration 729.83 kB Last Modified 05/06/2013
UL/cUL; Class 1, Div. 2 230.89 kB Last Modified 02/27/2019