ProSoft MVI69-MCM Product Description

MVI69-MCM (Modbus Master/Slave Communication Module) is a high-performance dual-channel Modbus serial communication module developed by ProSoft for the Rockwell CompactLogix / MicroLogix 1500 platform. It provides 2 independent, fully isolated RS-232/422/485 ports that can be independently configured as Modbus master or slave, supporting both RTU/ASCII protocols. It is an industrial-grade standard solution for medium and large-scale systems, multi-device networking, and high-speed data interaction.

I. Model Interpretation

MVI69: Standard series of CompactLogix 1769 platform

MCM: Modbus Master/Slave (Modbus Master/Slave Station)

Core Positioning: Two independent serial ports, full electrical isolation, any combination of master/slave, large-capacity data buffer, high performance, single slot, zero PLC load

II. Core Hardware Specifications

Compatible Platforms

CompactLogix: Full series L20/L23/L30/L31/L32/L35, L43/L45 (v16.03+)

MicroLogix 1500: LRP firmware v6.0+

1769 I/O bus, single-slot installation

Backplane power consumption: Maximum 800mA @ 5.1VDC

Serial interfaces (3 ports)

Application ports (P1, P2): 2 independent, jumpers selectable for RS-232/RS-422/RS-485, RJ45 (with DB9 adapter)

RS-232: Supports hardware handshake (RTS/CTS)

RS-485: 2-wire half-duplex, 32 nodes, long distance (1200m@19200bps)

Configuration port (CFG): 1 channel, only RS-232, for configuration/debugging

Electrical isolation: 500Vrms optical isolation (between backplane and serial ports)

Baud rate: 110 ~ 115200 bps

Data format: 7/8 data bits, 1/2 stop bits, no / even / odd parity

Data buffer: 4000 bytes (2000 bytes read / 2000 bytes write) super-large bidirectional database

Modbus capacity

Each port can be independently configured as a master or slave

Master mode: Each port can have a maximum of 64 commands, polling 32 slave stations

Slave mode: Each port can be fully accessed by the remote master station

Supported function codes: 1, 2, 3, 4, 5, 6, 8, 15, 16, 17, 22, 23

Data format: Standard 16-bit integer, standard floating point, Enron/Daniel floating point

LED status: OK, BP, CFG, P1, P2, ERR six groups of indicator lights

Operating environment

Temperature: 0°C ~ +60°C

Storage: -40°C ~ +85°C

Humidity: 5% ~ 95% (no condensation)

Certification: CE, UL, cURus, RoHS

III. Core Functions and Performance

1. Dual-channel independent Modbus communication (core advantage)

Dual ports are completely independent

P1 and P2 ports do not interfere with each other, can run different protocols, modes, and baud rates simultaneously

Flexible networking: Master + Master, Master + Slave, Slave + Slave in any combination

Protocol support: Modbus RTU (efficient binary) and Modbus ASCII (compatible with old devices)

Strong polling capability of the master station

64 user-defined commands per port, supporting continuous, conditional, and event-triggered

Command priority, polling interval, and retry count can be finely configured

Support for broadcast write commands, simultaneously controlling multiple slave stations

Transparent communication of slave stations

As a Modbus slave station, respond to all standard function codes

Direct mapping of database to PLC memory, remote master station can directly read and write PLC data

Advanced data processing

Support for floating-point, bit operations, word/byte order swapping, compatible with all third-party devices

Data scaling, slope/intercept correction, directly processing raw data from instruments

Real-time monitoring of command status, response time, and error count

2. Seamless integration with PLC system

Deep integration with Studio 5000/RSLogix

Provides AOI, UDT, example programs, no need for low-level protocol programming

Module status, port status, commands, errors all mapped to PLC tags

Configuration files saved to PLC project, one-click backup/restore ProSoft Configuration Builder (PCB)

Visual drag-and-drop configuration, command editor, data monitoring

Online debugging, data capture, log analysis

Configuration export/import, batch deployment, project cloning

3. Industrial-grade reliability

Full electrical isolation

500Vrms isolation: anti-surge, anti-static, eliminating ground circulation, protecting PLC and field devices

Powerful diagnostics and redundancy

Automatic reconnection in case of disconnection, command retry, timeout handling

Detailed error codes, event logs, communication statistics

Dual-port redundancy, hot backup of critical links

Independent operation

Zero PLC CPU load,不影响 system scanning time

Module failure does not affect PLC host

4. Core features and advantages

1. High performance， large capacity

Two independent ports： double communication capability， saving slots， reducing costs

4000-word database： meeting requirements for massive data collection， large SCADA systems

128 main station commands (64×2)： preferred for complex multi-device networking

500V full isolation： stable operation in extreme industrial environments

2. Flexible， universal

RS-232/422/485 three modes： compatible with all serial devices

Any combination of master/slave stations： suitable for all networking architectures

RTU/ASCII dual protocols： fully compatible with old and new devices

Compatible with CompactLogix/MicroLogix： cross-platform universal

3. Easy to use， reliable

AOI/UDT ready to use out of the box： rapid development， reducing debugging

PCB visual configuration： lowering technical threshold， improving efficiency

Industrial design， wide temperature range， no fan： long-term stability， maintenance-free

3-year warranty， global technical support： ensuring investment， trouble-free operation

5. Typical application scenarios

Medium-sized OEM equipment： dual-path independent connection of Modbus instruments， frequency converters， servo， HMI

Multi-device data collection： polling 32+ Modbus slave stations (instruments， sensors， PLCs)

Dual network communication between PLCs： dual-link redundancy between CompactLogix and third-party PLCs

SCADA system： as a Modbus slave station， connecting to upper-level SCADA

Old factory renovation： dual-path parallel upgrade， simultaneously connecting new and old Modbus devices

Distributed control： RS-485 long-distance networking， remote I/O， drivers， instruments

6. Summary

MVI69-MCM is the flagship standard module for Modbus serial communication on the CompactLogix platform. With two independent fully isolated serial ports (RS-232/422/485)， any combination of master/slave stations， Modbus RTU/ASCII dual protocols， 4000-word ultra-large database， 128 main station commands， zero PLC load， deep integration with Studio 5000， industrial-grade reliability， 3-year warranty， as core advantages， it is designed specifically for medium-sized systems， multi-device networking， high-speed data interaction， critical link redundancy， large-scale old factory renovation， and is a high-performance， high-reliability， one-stop industrial-grade solution for Rockwell PLCs accessing Modbus serial networks.