ProSoft Technology MVI69-DFNT Modules

Technical Dossier

Product Details And Specifications

ProSoft Technology MVI69 Series: Comprehensive Module Range and Technical Overview

The ProSoft Technology MVI69 series is a family of in-rack communication modules engineered for the Allen-Bradley MicroLogix 1500 (Series B) and CompactLogix (1769) backplane platforms. Deployed across petrochemical refineries, offshore platforms, nuclear auxiliary systems, water treatment facilities, and continuous process plants, the MVI69 line functions as a protocol gateway — bridging legacy fieldbus networks and modern Ethernet-based control architectures without requiring a separate gateway hardware chassis. Each module occupies a single slot in the 1769 backplane and communicates with the host processor via the standard backplane data transfer mechanism, exchanging data through mapped I/O image registers. The series supports both master and slave configurations across a wide range of industrial protocols, making it a standard specification item in brownfield DCS migration projects and long-term plant maintenance contracts globally.

The Evolution of MVI69 Architecture

The MVI69 platform was introduced in the mid-2000s as ProSoft Technology's response to the growing demand for protocol conversion within the CompactLogix ecosystem. Early revisions of the series used a dual-port memory architecture with a fixed block-transfer size of 60 words per scan. Subsequent firmware generations expanded the configurable block size and introduced ProSoft Configuration Builder (PCB) as the unified configuration utility, replacing earlier serial-terminal-based setup procedures.

The MVI69 hardware form factor is electrically and mechanically compatible with the 1769 bus, but it is not a Rockwell Automation product — it is a third-party option module. This distinction is critical for system integrators: the module does not consume a controller slot in the Logix I/O tree in the same manner as native 1769 I/O, but it does consume backplane current and must be accounted for in power budget calculations. Modules in this series are compatible with RSLogix 500 (for MicroLogix 1500) and Studio 5000 / RSLogix 5000 (for CompactLogix), with Add-On Instructions (AOI) and sample ladder logic provided by ProSoft for each protocol variant.

As of 2024, the MVI69 series is in a mature/end-of-active-development phase. ProSoft Technology continues to provide firmware support and replacement units, but new protocol variants are being introduced on the MVI69E (EtherNet/IP-based) and PLX31 platform families. For plants with existing MVI69 installations, long-term maintenance support — including refurbished exchange units, configuration backup services, and cross-reference to successor models — remains the primary procurement strategy.

MVI69 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed models within the MVI69 series. Units are classified by primary protocol function.

DF1 / Serial Communication

• MVI69-DFNT: DF1 Master/Slave to EtherNet/IP — bridges DF1 serial devices to EtherNet/IP network via CompactLogix backplane.
• MVI69-DF1: Dual-port DF1 Master/Slave module — supports simultaneous master and slave operation on two independent RS-232/422/485 ports.

Modbus Protocol

• MVI69-MNET: Modbus TCP/IP Client/Server — connects Modbus TCP devices to CompactLogix over Ethernet; supports up to 30 client commands.
• MVI69-MCM: Modbus RTU/ASCII Master/Slave — serial Modbus gateway with configurable baud rate, parity, and command list up to 100 entries.
• MVI69-MNETC: Modbus TCP/IP Client — client-only variant optimized for polling remote Modbus TCP servers.
• MVI69-MNETR: Modbus TCP/IP with Reduced Data Block — designed for applications with limited backplane bandwidth requirements.

PROFIBUS

• MVI69-PDPMV1: PROFIBUS DP-V1 Master — supports cyclic and acyclic data exchange; compatible with GSD file-based device configuration.
• MVI69-PBS: PROFIBUS DP Slave — configures the CompactLogix as a PROFIBUS DP slave device on an existing master network.

DeviceNet

• MVI69-DNET: DeviceNet Master/Slave — supports explicit and implicit messaging; configurable as scanner or adapter on the DeviceNet network.

DNP3 / IEC Protocols

• MVI69-103: IEC 60870-5-103 Master — for protection relay communication in substation automation environments.
• MVI69-101: IEC 60870-5-101 Master/Slave — serial telecontrol protocol for SCADA-to-RTU communication.
• MVI69-104: IEC 60870-5-104 Client/Server — TCP/IP variant of IEC 101 for modern SCADA integration over Ethernet.
• MVI69-DNPSNET: DNP3 Serial and Ethernet — dual-mode DNP3 module supporting both serial and TCP/IP simultaneously.

ASCII / Generic Serial

• MVI69-GSC: Generic ASCII Serial Communication — configurable for custom ASCII string parsing; used with barcode readers, scales, and legacy instruments.

EtherNet/IP & Other Ethernet

• MVI69-HART: HART Master — reads HART device variables from field instruments connected via HART multiplexer or direct wiring.
• MVI69-PNIO: PROFINET IO Device — configures the CompactLogix as a PROFINET IO device on a PROFINET controller network.

Sourcing Hard-to-Find & Obsolete MVI69 Parts

DriveKNMS maintains a dedicated inventory channel for MVI69 series modules, including units that have been discontinued from ProSoft Technology's active production schedule. For plants operating MicroLogix 1500 or first-generation CompactLogix systems — platforms that are themselves approaching end-of-life — the MVI69 module is often the last critical spare required to maintain a functional control loop without a full system retrofit.

DriveKNMS sources MVI69 units through authorized surplus channels, factory-refurbished exchange programs, and decommissioned plant asset recovery. All units are serialized, and original firmware versions are documented prior to any refurbishment. For customers requiring a specific firmware revision to maintain compatibility with an existing PCB configuration file, this information is captured at intake and matched to order requirements. Cross-reference to successor platforms (MVI69E, PLX31) is provided on request, including I/O mapping comparison and backplane current budget analysis.

Quality Control for the MVI69 Range

MVI69 modules incorporate a dual-port memory interface between the backplane ASIC and the onboard processor. Quality verification for this series requires functional testing of both the backplane communication path and the protocol-side port independently, then in combination under simulated load.

DriveKNMS applies the following test sequence to all MVI69 units processed through its facility: (1) Visual inspection of the 1769 bus connector pins and front-panel port connectors for mechanical damage or corrosion. (2) Backplane communication test using a live CompactLogix chassis — the module must enumerate correctly and exchange data blocks without CRC errors over a minimum 30-minute soak period. (3) Protocol-port functional test using a hardware simulator matched to the module's protocol type (e.g., Modbus RTU master simulator for MVI69-MCM, PROFIBUS DP analyzer for MVI69-PDPMV1). (4) Firmware version verification and documentation. (5) Final burn-in at operating temperature with continuous data transfer for 2 hours. Units that do not pass all five stages are quarantined and not offered for sale.