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.

A conformal coating option is available for this product.


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Características y Beneficios

  • 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

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

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


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