Product Introduction

PROSOFT MVI56E-MNET-CC is a Modbus TCP/IP Enhanced Network Interface module for Rockwell 1756 ControlLogix systems, used to connect Logix PACs to Modbus TCP/IP devices such as Modicon controllers, drives, and field instruments over Ethernet. It occupies a single 1756 slot and appears to the CPU as an I/O module with a mapped Modbus data area.

The module supports simultaneous Modbus TCP/IP client and server operation, multi‑client architectures with up to tens of concurrent connections, and user‑defined data mapping up to thousands of 16‑bit registers, which allows it to act as a central data concentrator and reduce the number of external gateways and Ethernet drops in the cabinet. Always confirm whether your project requires the standard, reduced‑block, or multi‑client MNET variant and match controller firmware and AOI versions accordingly.

Frequently Asked Questions

Q: Does the MVI56E-MNET-CC support hot-swapping in a ControlLogix rack?
A: Honestly, yes at the hardware level, but you should not rely on that in a live process. ControlLogix supports online insertion/removal, and this module is specified as a single‑slot 1756 card, but dropping a network interface that may handle up to 30 clients and 40 servers can disrupt PLC, SCADA, and third‑party connections. In practice, inhibit the module, verify the process can tolerate a Modbus TCP/IP outage, and schedule a short maintenance window.

Q: Is the MVI56E-MNET-CC obsolete, and what are the direct replacements?
A: The product family information shows E‑series MVI56E‑MNET and MVI56E‑MNETC variants as the current enhanced modules, with older MVI56‑MNET marked as legacy but still backward compatible. If PROSOFT lists your exact “‑CC” variant as special or legacy, the likely replacement is the nearest MVI56E‑MNETC or MVI56E‑MNET model with the same multi‑client capability; you must confirm this in the latest product bulletin and verify connection limits, data block size, and environmental ratings before treating it as a drop‑in.

Q: Will I lose my Modbus TCP/IP configuration when replacing the module?
A: The most common mistake is swapping the card without pulling the configuration from its Ethernet port first. Use ProSoft Configuration Builder and, if available, the on‑board web server to back up the configuration file and document key parameters: IP settings, client/server definitions, connection counts, Modbus register mapping, and diagnostic tag layout. After installing the new MVI56E‑MNET‑CC (or equivalent MNETC), align the firmware major revision, restore the config, and then validate every critical client and server path before you hand the system back to operations.