Product Description of ProSoft MVI69L-MBS

MVI69L-MBS (Modbus Serial Lite Communication Module) is an economical single-channel Modbus serial communication module specially designed by ProSoft for the Rockwell CompactLogix platform. Through one configurable RS-232/422/485 serial interface, it enables the master/slave communication between CompactLogix PLC and Modbus RTU/ASCII devices (sensors, frequency converters, meters, HMI), providing a cost-effective solution for small OEM devices and simple Modbus networking. ProSoft Technology Inc. 

I. Model Analysis

MVI69L: CompactLogix 1769 platform-specific Lite (economy) series

MBS: Modbus Serial (Modbus serial)

Core Positioning: Single serial port, configurable master/slave stations, Modbus RTU/ASCII, economy type, single-slot installation, zero PLC load

II. Core Hardware Specifications

Compatible Platforms: Full series CompactLogix (L1x–L7x, not supporting MicroLogix 1500), 1769 I/O bus, single-slot installation by ProSoft Technology Inc

Backplane Power Consumption: Maximum 450mA @ 5.1VDC

Serial Interfaces (2 Ports)

Application Port (P1): 1 channel, jumpers selectable for RS-232 / RS-422 / RS-485, RJ45 interface

Configuration Port (CFG): 1 channel, only RS-232, for module configuration and debugging

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

Baud Rate: 110 ~ 115200 bps configurable

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

Data Buffer: 480 bytes (240 bytes read / 240 bytes write) bidirectional database by ProSoft Technology Inc

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

Master Station Commands: Up to 30 Modbus master station commands by ProSoft Technology Inc

LED Status: OK, BP, CFG, P1, ERR five 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. Modbus Serial Communication (Core Advantage)

Single independent serial channel

Can be software-configured as Modbus master station or Modbus slave station by ProSoft Technology Inc

Master Station Mode: Active polling up to 32 Modbus slave station devices, executing 30 predefined commands

Slave Station Mode: As a Modbus node, allowing remote master station to read and write module database by ProSoft Technology Inc

Protocol Support: Modbus RTU (binary, efficient) and Modbus ASCII (character, compatible with old devices) by ProSoft Technology Inc

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

Data Transmission and Processing

Support standard floating point and Enron/Daniel floating point formats by ProSoft Technology Inc

Module independent processing of communication, zero PLC CPU scanning load by ProSoft Technology Inc

Data directly mapped to PLC controller tag, no complex programming required by ProSoft Technology Inc

2. Seamless Integration with PLC System

Deep integration with Studio 500 Provide AOI (Add-On Instruction) and UDT (User Defined Tag), ready to use out of the box by ProSoft Technology Inc.

Module configuration: Automatically backup to PLC project (ACD file) ProSoft Technology Inc.

Port status, command status, error codes: Real-time mapping to PLC tags ProSoft Technology Inc.

Trigger commands and reset channels through ladder diagram ProSoft Technology Inc.

Simplifies development and debugging

ProSoft Configuration Builder (PCB) visual configuration ProSoft Technology Inc.

Configuration files: Export/import, supports batch deployment ProSoft Technology Inc.

Online monitoring: Data transmission, command execution, fault diagnosis ProSoft Technology Inc.

3. Industrial-grade reliability

Electrical isolation protection

500Vrms optical isolation: Anti-surge, anti-static, eliminating ground potential difference, protecting PLC and field devices

Powerful diagnostic function

Real-time monitoring: Port status, communication quality, command errors, slave station response ProSoft Technology Inc.

Detailed error codes and event logs, quick fault location ProSoft Technology Inc.

Compact and durable design

Single slot, no fan, suitable for narrow cabinets and harsh industrial environments ProSoft Technology Inc.

Independent operation: Module failure does not affect PLC host system ProSoft Technology Inc.

Four. Core features and advantages

1. High cost-effectiveness (Lite series core)

Single port, simplified functions: Designed for small, low-cost applications ProSoft Technology Inc.

480-byte database: Satisfies basic data acquisition and control requirements ProSoft Technology Inc.

30 master station commands: Covering most OEM device communication scenarios ProSoft Technology Inc.

Affordable price: Compared to standard MVI69-MCM, cost reduction, extremely high cost-effectiveness ProSoft Technology Inc.

2. Easy to use

AOI/UDT ready to use out of the box: No need for Modbus protocol programming, quick launch ProSoft Technology Inc.

Master/Slave switch in one click: Flexible adaptation to networking architectures ProSoft Technology Inc.

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

Single-slot design: Saves cabinet space, easy installation ProSoft Technology Inc.

3. Stable and reliable

Full electrical isolation: Industrial-grade anti-interference

Wide temperature, no fan: Long-term stable operation

Zero PLC load: Does not affect system performance ProSoft Technology Inc.

Five. Typical application scenarios

OEM equipment integration: CompactLogix connects Modbus instruments, frequency converters, sensors (small machinery, packaging machines) ProSoft Technology Inc. Simple Data Collection: Reading process data such as temperature, pressure, and flow from Modbus slave devices. ProSoft Technology Inc.

PLC Communication: CompactLogix acts as the master station, polling other PLC/controllers (Modbus slave devices). ProSoft Technology Inc.

Renovation of Old Factory: Integrating traditional Modbus devices into the modern CompactLogix system. ProSoft Technology Inc.

HMI Connection: Modbus HMI interacts with CompactLogix data. ProSoft Technology Inc.

Distributed I/O: Connecting remote Modbus I/O modules via RS-485 bus.

VI. Summary

MVI69L-MBS is the entry-level Modbus serial communication solution for the CompactLogix platform. With single-channel fully isolated serial port (RS-232/422/485), configurable master/slave stations, dual protocols of Modbus RTU/ASCII, 480-byte database, 30 master station commands, zero PLC load, deep integration with Studio 5000, industrial-grade reliability, and ultra-high cost-effectiveness, it is specifically designed for OEM equipment, small systems, simple networking, and cost-sensitive projects. It is an economical and efficient solution for Rockwell PLCs to connect to Modbus serial devices. ProSoft Technology Inc.