Description
The PROSOFT MVI56-LTQ is a Limitorque Valve Actuator Master Communication Module designed for the Rockwell Automation ControlLogix platform. It provides an interface between ControlLogix processors and Limitorque valve actuators or other devices using compatible Limitorque protocols.
The module operates as an I/O interface between the ControlLogix backplane and the valve network. ControlLogix ladder logic exchanges valve commands and status information with the module through a 1,500-word register space.
🔧 Key Features
• ProSoft Technology MVI56 series module
• Limitorque Valve Actuator Master communication
• Designed for Rockwell ControlLogix
• Single-slot 1756 backplane compatible
• Supports local or remote rack installation
• Two serial application ports
• RS-232 / RS-485 / RS-422 communication
• Software-configurable communication parameters
• 500 V optical isolation from backplane
• Full hardware handshaking
• 1,500-word register data space
• Ladder Logic-based data transfer
📋 Product Datasheet
• Brand: PROSOFT Technology
• Model: MVI56-LTQ
• Product Type: Limitorque Valve Actuator Master Communication Module
• Platform: Rockwell Automation ControlLogix
• Backplane: 1756-compatible, single slot
• Application Ports: 2 serial ports
• Serial Interfaces: RS-232 / RS-485 / RS-422
• Baud Rate: 110 to 115,200 baud
• Data Bits: 5, 6, 7, or 8
• Stop Bits: 1 or 2
• Parity: None, Odd, or Even
• Backplane Current: 800 mA @ 5 VDC; 3 mA @ 24 VDC
• Optical Isolation: 500 VDC from backplane
• Operating Temperature: 0 to 60 °C
• Storage Temperature: -40 to 85 °C
• Relative Humidity: 5–95%, non-condensing
• Dimensions: Approx. 145 × 95 × 30 mm*
• Weight: Approx. 0.5 kg*
• Mounting: ControlLogix 1756 chassis
• Country of Origin: USA*
The manufacturer datasheet specifies the 800 mA @ 5 VDC backplane load, 3 mA @ 24 VDC load, 0–60 °C operating range, two serial application ports, configurable RS-232/485/422 communications, and 500 V optical isolation.
🏭 Typical Applications
The MVI56-LTQ is suitable for:
• Electric valve actuator control
• Oil and gas pipelines
• Water treatment systems
• Power generation
• Petrochemical plants
• Process automation
• Industrial valve networks
• ControlLogix-based SCADA systems
⚡ Functional Description
The module serves as the communication bridge between a ControlLogix processor and Limitorque valve actuators. Data received from the valve network is placed into the module’s register space for use by the ControlLogix processor, while commands generated by ladder logic are transferred back to the module for execution on the valve network.
Communication parameters can be configured for baud rate, parity, data bits, stop bits, and RTS timing. The two application ports provide flexibility for connecting compatible Limitorque equipment and communication networks.
🔌 Installation & Configuration
Basic installation procedure:
• Confirm the ControlLogix chassis and slot compatibility
• Install the MVI56-LTQ into an available 1756 chassis slot
• Connect the supplied RJ45-to-DB9 serial cables
• Connect the valve actuator network
• Configure serial communication parameters
• Configure Limitorque network parameters
• Import or develop the required ladder logic
• Map valve status and command registers
• Verify communication diagnostics
🛠️ Commissioning Checklist
• Verify module status LED
• Confirm backplane communication
• Check serial-port activity
• Verify baud rate and protocol settings
• Confirm valve actuator addressing
• Test valve status feedback
• Test open/close commands
• Verify actuator alarms and fault indications
• Confirm ControlLogix data mapping
⚠️ Technical Note
The MVI56-LTQ is not a general-purpose Modbus communication module. It is specifically designed as a Limitorque Valve Actuator Master interface for ControlLogix systems. Using the correct Limitorque configuration and ladder-logic data mapping is important when commissioning or replacing the module.
📦 Ordering Information
PROSOFT MVI56-LTQ | Limitorque Valve Actuator Master Communication Module | ControlLogix 1756 | RS-232/485/422
ProSoft currently lists the MVI56-LTQ with limited availability, and its product page provides the datasheet, user manual, sample ladder logic, and lifecycle documentation.
