Overview

The MVI56-MCM Modbus Master/Slave Communication Module allows Rockwell Automation® ControlLogix® processors to interface easily with other Modbus protocol compatible devices. It acts as an Options module between the Modbus network and the ControlLogix backplane. Compatible devices include Modicon® PLCs and a wide range of process and control devices. Many SCADA packages also support the Modbus protocol.

Features and Benefits

• Licensed Backplane Technology:

  • Manufactured under license from Rockwell Automation®.
  • High-speed data transfer between MVI56 module and ControlLogix processor.
  • Installs as a Generic 1756 module, with sample ladder logic included.
  • Module data and status visible in RSLogix™ 5000 controller tags.

• Modbus Slave Protocol Interface:

  • Emulates Modbus slave devices on individually-configurable application ports.
  • Supports Modbus RTU and Modbus ASCII protocol versions.
  • Supports floating-point data movement, including Enron, Daniel®, and other implementations.
  • Suitable for SCADA and field device interface applications.

• Easy to Configure and Monitor:

  • Configuration and monitoring in RSLogix.
  • LED diagnostics for quick health checks.
  • Menu-driven hardware and protocol diagnostics.
  • Module database accessible through serial connection to desktop PC.

• Backed by ProSoft Technology:

  • 20-year history of delivering high-quality, reliable solutions.
  • Free, unlimited, worldwide Technical Support by phone.
  • Three-Year Warranty ensures reliability.
  • Free ProSoft software tools for seamless integration.

General Specifications

• Single Slot - 1756 Backplane Compatible:
  • Can be installed in local or remote racks.
  • Recognized as an Input/Output module with access to processor memory for data transfer.
  • Uses ladder logic for data transfer, with user-defined ladder configuration.

Modbus Master/Slave Communication Parameters

• Baud rate: 110 to 115K baud.
• Stop bits: 1 or 2.
• Data size: 7 or 8 bits.
• Parity: None, Even, Odd.
• RTS timing delays: 0 to 65535 milliseconds.

Modbus Function Codes Supported

• Read Coil Status
• Read Input Status
• Read Holding Registers
• Read Input Registers
• Write Single Coil
• Write Single Holding Register
• Diagnostics (Slave Only)
• Write Multiple Coils
• Write Multiple Holding Registers
• Report Slave ID (Slave Only)
• Mask Write Holding Register (Slave Only)
• Read/Write Holding Registers (Slave Only)

Functional Specifications

Modbus Master

• Configured as a virtual Modbus Master for actively issuing commands to other nodes.
• Up to 100 commands per Master port, fully configurable.

Modbus Slave

• Configured as a Modbus slave to allow remote Masters to interact with module data.
• Node address selectable from 1 to 247.
• Error codes, counters, and port status available per configured slave port.

Hardware Specifications

• Backplane Current Load: 800 mA @ 5 Vdc, 3 mA @ 24 Vdc.
• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C (-40°F to 185°F).
• Shock: 30 g operational, 50 g non-operational.
• Vibration: 5 g from 10 Hz to 150 Hz.
• Relative Humidity: 5% to 95% (without condensation).

LED Indicators

• Module Status
• Backplane Transfer Status
• Application Status
• Serial Activity

Debug/Configuration Port (CFG)

• RJ45 (DB-9M with supplied cable), RS-232 only.

Application Ports (PRT1 & PRT2)

• Full hardware handshaking control.

• Software configurable communication parameters.

• Baud rate: 110 to 115,200 baud.

• RS-232, RS-485, and RS-422 support.

• Parity: None, Odd, Even.

• Data bits: 5, 6, 7, or 8.

• Stop bits: 1 or 2.

• RTS on/off delay: 0 to 65535 milliseconds.

• Optical isolation from backplane.

• Shipped with: RJ45 to DB-9M cables for each port, 6-foot RS-232 configuration cable.