- Model: MVI69-MCM
- Brand: PROSOFT Technology
- Series: 1769 CompactLogix / MicroLogix in-rack Modbus modules
- Core Function: Modbus RTU/ASCII master or slave for 1769 CompactLogix and MicroLogix 1500
- Product Type: Modbus serial network interface module
- Key Specs: Single-slot 1769 | 2 serial ports | 110–115,200 baud | 800 mA @ 5 V
- Condition: New Original (New Surplus)
Product Introduction
PROSOFT MVI69-MCM Modbus Master/Slave Network Interface Module lets a 1769‑based CompactLogix or MicroLogix 1500 LRP controller communicate with Modbus RTU/ASCII devices such as Modicon PLCs, drives, and field instruments without external gateways. The module occupies a single 1769 slot, appears as an I/O module to the processor, and uses ladder logic plus a configuration file to move Modbus data into controller memory.
The module offers two configurable serial application ports and a dedicated configuration port, supports both master and slave roles with up to 30 commands per port, and handles Enron and Daniel floating‑point formats, which makes it suitable for mixed SCADA and device‑level integration in brownfield systems. Before standardizing on it, confirm your 5 V backplane power margin, controller model compatibility, and required Modbus throughput and command count.
Frequently Asked Questions (FAQ)
Q: Does the MVI69-MCM support hot-swapping in a CompactLogix rack?
A: Honestly, you should not plan on live swapping 1769 modules in a production rack, even if the hardware can tolerate brief insertion/removal. The module is recognized as an I/O device with backplane connections, and yanking it will upset the CompactLogix or MicroLogix backplane and drop all Modbus communications instantly. Treat replacement as a planned outage task: place the processor in program mode or inhibit the module, verify power is stable, and only then remove the card.
Q: Is the MVI69-MCM obsolete, and is there a direct replacement?
A: The product now sits in the vendor’s legacy/Support section, which signals that it remains supported but is no longer a front‑line platform. Some plants migrate to newer in‑rack or gateway‑based Modbus solutions when they refresh CompactLogix hardware. If you must design new systems, check the latest migration notes and see whether a newer CompactLogix‑native Ethernet Modbus module or an external gateway is the recommended path, then confirm I/O image sizes and ladder changes before committing.
Q: Will I lose my Modbus configuration when I replace the module?
A: The most common mistake is assuming the ladder and tags are the whole configuration. In reality, MVI69‑MCM uses a text‑based configuration file plus ladder logic to define commands and mapping. Before pulling the old module, back up the configuration file using ProSoft Configuration Builder, archive the sample ladder with any site modifications, and record assembly instance sizes; after installing the new module, re‑download the configuration and verify module status and application status LEDs before putting the controller back in run.
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