- Model: MVI56E-MCM
- Brand: ProSoft Technology
- Series: ControlLogix In-chassis MVI56E
- Core Function: Connect ControlLogix to Modbus RTU ASCII devices as Master or Slave
- Product Type: Modbus Master Slave communication module
- Key Specs: 2 serial ports RS-232 RS-422 RS-485 | 10,000 word database | 800 mA @ 5 V
- Condition: New Original (New Surplus) — verify cosmetic and electrical condition with supplier
Product Introduction
ProSoft MVI56E-MCM is a ControlLogix in-chassis Modbus communication module that connects Allen-Bradley processors to Modbus RTU and ASCII networks over dual serial ports. Typical uses include integrating drives, RTUs, analyzers, power meters, and third-party PLCs into a Logix control system without external gateways.
The module supports Master and Slave operation on each port, up to 5,000 registers per port, and a tag-based database that appears as standard I/O data in the controller. This approach reduces external hardware, simplifies Modbus diagnostics, and provides an upgrade path from older MVI56-MCM hardware while maintaining backward-compatible data mapping.
Frequently Asked Questions
Q: Does the MVI56E-MCM support hot-swapping in a ControlLogix rack?
A: Electrically, it follows normal 1756 module rules, so you can insert or remove it from a powered chassis if Rockwell’s ControlLogix platform and your plant standards allow that practice. The real risk is process impact: pulling the module instantly drops all Modbus communications on both ports, which can trip drives or freeze data into the PLC, so we only treat it as a controlled maintenance action with the process in a known safe state. Document your hot-swap procedure and confirm chassis and power supply ratings in the Rockwell manuals before you rely on it.
Q: Is the MVI56E-MCM obsolete, and what are the replacement options?
A: The MVI56E-MCM is the enhanced successor to the older MVI56-MCM, with Ethernet configuration, larger database handling, and Logix integration features such as Add-On Profiles. ProSoft also offers the MVI56E-MCMXT for extended temperature and conformal-coated applications, plus the MVI56E-MCMR variant for remote racks with smaller packet sizes, so you should treat those as platform variants rather than drop-in replacements unless your environmental or rack layout forces the change. Always confirm lifecycle status, last-time-buy dates, and recommended migration paths directly in ProSoft’s current product bulletins.
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