ProSoft MVI56E-MNET ControlLogix Modbus TCP/IP Enhanced Interface Module

The ProSoft MVI56E-MNET, also cataloged as the MVI56E-MNET Enhanced Network Interface Module, operates as a dedicated hardware component for Modbus TCP/IP Client/Server data conversion within Allen-Bradley ControlLogix platforms.

Hardware Specifications

Protocol Conversion Latencies & Network Performance

The module interfaces directly with standard 1756 ControlLogix backplanes, running concurrent Modbus TCP/IP Client and Server software stacks via a single RJ45 interface. The communication processor routes network data packages straight into an internal database containing 5000 16-bit registers.

By eliminating standalone serial-to-ethernet bridges, the hardware achieves low protocol conversion latencies. It integrates into the host controller memory maps using standard Add-On Instructions (AOI) or sample ladder logic. The internal memory layout matches legacy MVI56 parameter profiles, enabling backward compatibility for drop-in physical replacement without requiring complete application code overhauls.

Frequently Asked Questions

Q: Does the MVI56E-MNET module support Remove and Insert Under Power (RIUP) actions? A: Yes. The electrical interface is compliant with 1756 ControlLogix chassis hot-swap standards, allowing live module replacement while backplane power is active. However, removing the module instantly drops all active Modbus TCP/IP sockets and halts asynchronous backplane block transfers.

Q: How is configuration data extracted or updated on the module over the plant network? A: The module supports CIPconnect, which enables ProSoft Configuration Builder software running on a network PC to bridge through the ControlLogix processor. This permits remote configuration downloads, configuration uploads, and diagnostic access without requiring a direct connection to the module's local port.

Q: Can this module maintain configuration variables if the chassis experiences a total power outage? A: Yes. Configuration parameters, network tables, and operational profiles are saved directly to internal non-volatile memory arrays. Onboard battery status is actively tracked by the ERR LED to warn of physical cell degradation affecting volatile register backup.

Field Installation Guidelines

• Chassis Installation and Interlocking: Power down the system if regional safety rules require it, though hot-swapping is supported. Slide the module straight into any unreserved slot of a grounded 1756 ControlLogix chassis until the top and bottom retention tabs click into position.
• Network Infrastructure Shielding: Connect the RJ45 port to the local automation network using high-quality Category 5e or higher shielded twisted-pair (STP) copper cabling. Ensure the cable shield terminates at the network switch housing to isolate the signaling path from common industrial electrical transients.
• Grounding Requirements: The 1756 chassis housing must be low-impedance bonded to the main enclosure ground panel. Verify that the chassis spring clips are clean and unpainted to maintain good electrical continuity with the module casing.