Description

Basic Information

• Model: MVI56-MNET
• Brand: ProSoft Technology (Rockwell Automation official partner)
• Full Name: Modbus TCP/IP Client/Server Communication Interface Module
• Compatible Host: Allen‑Bradley 1756 ControlLogix PLC chassis (occupies single slot)
• Warranty: 1 Year
• Lifecycle: Classic legacy model, upgraded version is MVI56E-MNET; widely used for old ControlLogix system maintenance replacement

1. Core Technical Specifications

1.1 Communication Performance

1. Ethernet Port

• Single 10/100Mbps auto-negotiation RJ45 Ethernet port, electrical isolation protection
• Protocol: Standard Modbus TCP/IP (fully compliant with Modbus IDA specification)

2. Master & Slave Capacity

• Modbus TCP Client (Master): Up to 32 independent TCP client connections (poll 32 sets of Modbus TCP slave devices simultaneously)
• Modbus TCP Server (Slave): Up to 8 server connections (allow upper DCS/SCADA/HMI to read/write PLC data via Modbus TCP)
• Supported Modbus function codes: 01/02/03/04/05/06/15/16/22/23 full set of standard codes for coils, discrete inputs, holding registers, input registersProSoft Te…

3. Data Mapping Capacity

• Max total register database: 10,000 16-bit Modbus registers (upload/download between module and ControlLogix controller)
• Data interaction: Transparent data exchange with Logix tags via backplane CIP bus, maximum 8192 bytes input + 8192 bytes output data buffer
• 

1.2 Power & Mechanical Parameters

• Backplane power consumption: 800mA @ 5VDC, 3mA @ 24VDC
• Dimensions: 147mm × 98mm × 64mm, Net weight ≈ 0.32kg
• Protection Class: IP20 (installed inside ControlLogix control cabinet only)
• Mounting: Standard 1756 single-slot plug-in structure, supports local chassis or remote ControlNet/EtherNet/IP distributed rack installation

1.3 Environmental & Industrial Protection

• Operating temperature: 0°C ~ +60°C
• Storage temperature: -40°C ~ +85°C
• Humidity: 5%–95% non-condensing
• Shock resistance: 30g operating, 50g non-operating; Vibration: 5g (10Hz–150Hz)
• Certifications: UL/cUL Class I Div 2 hazardous area approval, CE, RoHS
• Onboard diagnostics: LED indicators for Module Status, Network Status, Ethernet Link/Activity, fault alarm; built-in web server for remote parameter checking and troubleshooting

2. Product Overview

The MVI56-MNET is a rack-mounted dedicated communication coprocessor module embedded directly into the ControlLogix PLC backplane, the most mainstream solution for Rockwell Logix platform to connect Modbus TCP Ethernet devices.