ProSoft MVI56E Series Modules

Technical Dossier

Product Details And Specifications

ProSoft Technology MVI56E Series: Comprehensive Module Range and Technical Overview

The ProSoft Technology MVI56E series represents one of the most widely deployed communication module families in the Allen-Bradley ControlLogix platform. Installed across global heavy industry sectors — including petrochemical refineries, nuclear power facilities, offshore oil & gas platforms, and large-scale chemical processing plants — the MVI56E series provides protocol bridging between ControlLogix backplanes and legacy or third-party industrial networks. Its modular architecture allows a single ControlLogix chassis to interface with Modbus RTU/ASCII, DNP3, IEC 60870-5, PROFIBUS DP, and numerous other protocols without replacing existing field infrastructure. The series is a standard component in long-lifecycle DCS/PLC hybrid architectures where protocol interoperability is a non-negotiable operational requirement.

The Evolution of MVI56E Architecture

The MVI56E series is the enhanced successor to the original MVI56 series, introduced by ProSoft Technology to address the increasing demand for Ethernet-based configuration and diagnostics in ControlLogix environments. The original MVI56 modules communicated exclusively via the ControlLogix backplane and required RS-232/RS-485 serial connections for protocol ports. The MVI56E generation added an onboard Ethernet port, enabling web-based diagnostics, remote configuration via ProSoft Configuration Builder (PCB), and integration with plant-level SCADA systems without consuming additional network hardware.

Key architectural milestones: The MVI56 (Gen 1) established the protocol gateway concept within the ControlLogix chassis. The MVI56E (Gen 2) introduced the Ethernet diagnostics port and improved ladder logic sample code. The MVI56EMNET and MVI56E-MNET variants added Modbus TCP/IP alongside serial Modbus, enabling dual-protocol operation. As Rockwell Automation's ControlLogix platform evolved from the 1756-L6x to 1756-L7x and 1756-L8x processors, MVI56E modules maintained backward compatibility across chassis generations. Many MVI56E variants are now in the mature/end-of-active-development phase; ProSoft continues to provide firmware support and replacement stock, making third-party sourcing critical for facilities operating legacy installations.

MVI56E Full Catalog & Functionalities (SKU List)

The following SKUs represent the core MVI56E series product range, classified by communication protocol and function. Each module occupies one slot in a standard 1756 ControlLogix chassis.

Modbus Protocol Modules

• MVI56E-MCM: Modbus RTU/ASCII master/slave communication module with Ethernet diagnostics port — the most widely deployed variant in the series.
• MVI56E-MNET: Modbus TCP/IP and Modbus RTU combined module; supports simultaneous Ethernet and serial Modbus sessions.
• MVI56E-MNETC: Modbus TCP/IP client module; optimized for client-only Modbus TCP/IP polling of remote devices.
• MVI56E-MNETS: Modbus TCP/IP server module; responds to Modbus TCP/IP master queries from SCADA or HMI systems.
• MVI56E-MNETR: Modbus TCP/IP with reduced memory footprint; designed for high-density chassis configurations.

DNP3 Protocol Modules

• MVI56E-DNPSNET: DNP3 slave/server module with Ethernet port; used in utility SCADA and substation automation.
• MVI56E-DNPM: DNP3 master module for serial DNP3 networks; interfaces with RTUs and IEDs in power distribution systems.
• MVI56E-DNPS: DNP3 slave module for serial networks; responds to DNP3 master polling from control centers.

IEC 60870-5 Protocol Modules

• MVI56E-101S: IEC 60870-5-101 slave module; serial telecontrol protocol for power system SCADA integration.
• MVI56E-104S: IEC 60870-5-104 slave module; TCP/IP-based telecontrol for modern substation-to-control-center communication.

PROFIBUS Modules

• MVI56E-PDPMV1: PROFIBUS DP-V1 master module; manages PROFIBUS DP field device networks from within a ControlLogix chassis.
• MVI56E-PDPS: PROFIBUS DP slave module; presents the ControlLogix controller as a PROFIBUS DP slave device to a third-party master.

ASCII / Serial Communication Modules

• MVI56E-GSC: Generic serial communication module; supports custom ASCII protocols for barcode readers, weighing systems, and legacy serial devices.
• MVI56E-SIE: Serial interface module with enhanced buffering; used for high-throughput ASCII data collection applications.

Other Protocol Modules

• MVI56E-HART: HART protocol master module; reads HART device variables from 4–20 mA field instruments over existing wiring.
• MVI56E-LDM: Logix data mirror module; mirrors data between two ControlLogix controllers over Ethernet without a dedicated network switch port.

Sourcing Hard-to-Find & Obsolete MVI56E Parts

DriveKNMS maintains a dedicated inventory of MVI56E series modules, including variants that ProSoft Technology has transitioned to limited or end-of-life support status. For facilities operating ControlLogix systems with 10–20 year maintenance horizons — common in nuclear, refinery, and water treatment applications — the ability to source tested replacement modules without a full system upgrade is operationally and economically critical.

DriveKNMS sources MVI56E modules through authorized distribution channels and verified secondary market suppliers. All units undergo functional verification before dispatch. For discontinued variants where new stock is unavailable, DriveKNMS provides refurbished units with documented test records. Lead times for standard variants are typically 1–5 business days; rare or discontinued variants are quoted individually. Customers requiring long-term supply agreements for multi-year maintenance contracts are accommodated with reserved stock arrangements.

Quality Control for the MVI56E Range

MVI56E modules integrate directly into the ControlLogix backplane via the 1756 series connector. Quality verification for these modules requires protocol-specific test environments that replicate actual field conditions. DriveKNMS applies the following test procedures to all MVI56E units:

• Backplane communication verification using a live 1756-L7x or 1756-L8x processor with ProSoft sample ladder logic loaded.
• Protocol port functional test: each serial port (RS-232/RS-485) is tested with a hardware loopback and protocol analyzer to confirm correct framing, baud rate, and parity handling.
• Ethernet diagnostics port verification: web interface accessibility and PCB (ProSoft Configuration Builder) connectivity confirmed.
• Firmware version audit: module firmware is documented and compared against ProSoft's published firmware revision history.
• Thermal cycling: modules are operated under load for a minimum burn-in period to identify latent component failures before shipment.
• Visual inspection: backplane connector pins, faceplate LEDs, and port connectors inspected for mechanical damage or corrosion.