- Model: MVI56E-MNET
- Brand: ProSoft Technology (sold for Allen-Bradley ControlLogix)
- Series: ControlLogix in-chassis MVI56E
- Core Function: Connect ControlLogix to Modbus TCP IP devices as Client and Server
- Product Type: Modbus TCP/IP Client/Server enhanced network interface module
- Key Specs: 10/100 Base-T Ethernet | 5,000 16-bit registers | Single 1756 slot
- Condition: New Original (New Surplus) — confirm with supplier packing and test reports
Product Introduction
ProSoft MVI56E-MNET is a ControlLogix in-chassis Modbus TCP/IP Client/Server module that links Allen-Bradley processors to Ethernet-based Modbus devices through a single 10/100 Base-T interface. Typical uses include integrating drives, power meters, RTUs, PLCs, and SCADA front ends that speak Modbus TCP/IP directly into Logix control strategies.
The module exposes up to 5,000 16-bit registers as a user-definable database and exchanges this data with the controller via ladder logic or an AOI, which simplifies integration and supports migration from older MVI56-MNET hardware. For harsher installations, the MVI56E-MNETXT variant adds conformal coating and extended temperature while maintaining functional equivalence.
Frequently Asked Questions (FAQ)
Q: Does the MVI56E-MNET support hot-swapping in a ControlLogix rack?
A: Electrically it behaves like any other 1756 communication module, so insertion and removal under power follow Rockwell’s ControlLogix rules, but from a process perspective you should treat any swap as a planned outage because all Modbus TCP/IP communications will drop the moment you pull the module. Honestly, I only treat this as a controlled maintenance action with the process in a safe state, a documented rollback plan, and explicit confirmation that chassis, power supply, and CPU firmware fully support online module replacement.
Q: Is the MVI56E-MNET obsolete, and what are the direct replacements?
A: The MVI56E-MNET is the enhanced successor to the legacy MVI56-MNET and remains the standard Modbus TCP/IP in-rack interface for ControlLogix; ProSoft lists MVI56E-MNETXT as the extended-temperature, conformal-coated variant with the same functional behavior. For most users, migration from MVI56-MNET means dropping in MVI56E-MNET, reusing the existing ladder or switching to the AOI template, but you must review firmware notes and I/O assembly definitions before assuming one-to-one compatibility. Always verify lifecycle status and recommended migration paths with ProSoft’s current product information before committing to a plant-wide standard.
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