ProSoft MVI56‑LTQ Limitorque Valve Actuator Master Communication Module

Product Description

MVI56‑LTQ is a dedicated rack‑mounted communication gateway module developed by ProSoft Technology for Allen‑Bradley ControlLogix (1756‑series) PLC systemsProSoft Te.... It serves as 

the master interface to communicate with Limitorque electric valve actuators over serial Modbus protocol, enabling bidirectional data exchange: sending valve open/close/stop commands and 

receiving actuator feedback status, position data, fault alarms and diagnostic information to the ControlLogix processor. Widely deployed in petrochemical plants, natural‑gas pipelines, 

water‑treatment stations and industrial valve‑management control cabinets.

3. Technical Specifications

• Full Model: MVI56‑LTQ
• Brand: ProSoft Technology, Origin: United‑States
• Compatible Rack: Rockwell ControlLogix 1756 chassis, single‑slot installation
• Backplane Current Draw: 800 mA @ 5 VDC, 3 mA @ 24 VDCProSoft Te...
• Communication Ports: 2 × serial application ports (PRT1, PRT2), 1 × RS‑232 configuration debug (CFG) port
• Supported Protocol: Limitorque subset of Modbus RTU, master mode for valve actuators
• Data Function: Valve position control 0‑100%, emergency shutdown ESD command, digital I/O status reading, error‑code monitoring
• Indicators: LED status lamps for module, backplane transfer, application and serial activity
• Operating‑Temperature: 0℃ ~ +60℃ProSoft Te...
• Storage‑Temperature: ‑40℃ ~ +85℃ProSoft Te...
• Ambient Humidity: 5%‑95% non‑condensing
• Shock & Vibration: 30 g operational shock, 5 g vibration (10‑150 Hz)

• Certifications: CE, UL, industrial EMC compliance

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4. Key Features

1. Purpose‑built master gateway linking ControlLogix PLC and Limitorque valve actuator network
2. Dual independent serial ports allow connection to multiple valve devices on field loops
3. Full valve control functions: open, close, stop, emergency shutdown, position setting
4. Real‑time feedback acquisition of valve position, actuator faults and communication diagnostic counters
5. Direct hot‑swap capable single‑slot 1756 form‑factor, fast on‑site replacement
6. Built‑in comprehensive fault‑diagnosis and status‑monitoring functions to reduce troubleshooting downtime
7. Data exchange via ControlLogix backplane, configured through RSLogix 5000 ladder logic
8. Rugged industrial hardware suitable for long‑term continuous operation in oil & gas and process‑plant environments