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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Platform | Allen-Bradley ControlLogix (1756 chassis) |
| Form Factor | Single-slot in-chassis module |
| Function | Limitorque Valve Actuator Master Network Interface |
| Supported Devices | MX/DDC Modbus, UEC-3-DDC Modbus, DDC-100M, Valvcon IVO (multi-drop) |
| Max. Valves Supported | 150 |
| Communication Ports | Two application ports (PRT1 & PRT2) + CFG port |
| Electrical Interface | RS-232 or RS-485 (jumper selectable) |
| Baud Rate | 1,200 to 38,400 |
| Polling Scheme | Port A/B emulation (looped, Port 1 only, or Port 2 only) |
| Backplane Current Load | 800 mA @ 5.1 VDC; 3 mA @ 24 VDC |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to +85 °C |
| Relative Humidity | 5 % to 95 % (non-condensing) |
| LED Indicators | Module Status, Backplane Transfer, Application Status, Serial Activity |
| Data Transfer | Asynchronous via 1,500-word register space and ladder logic |
4. Product Introduction & Supply Chain Strategy
The ProSoft MVI56-LTQ is a single-slot ControlLogix module that enables Rockwell Automation processors to communicate directly with Limitorque valve actuators and compatible devices. It functions as a dedicated master interface, handling polling, data exchange, and command execution while transferring valve status and control data asynchronously to the processor.
Purchasing this module as New Surplus secures genuine unused inventory for a specialized application where OEM availability is limited. New units provide full expected service life and eliminate the reliability risks of refurbished modules, reducing total cost of ownership by preventing unplanned downtime on critical valve control systems.
MVI56-LTQ
MVI56-LTQ
5. Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Lock out and tag out power to the ControlLogix chassis. Wear a grounded ESD wrist strap. Record the existing module’s configuration, port settings, and ladder-logic tags. Confirm one free slot is available and that the chassis power supply can support the additional 800 mA load.
Stage 2: Removal
Power down the chassis completely. Disconnect any serial cables from the CFG, PRT1, and PRT2 ports. Release the module locking tabs and carefully slide the module out of the 1756 chassis slot.
Stage 3: Installation (Clone & Seat)
Set any jumpers for RS-232 or RS-485 as required. Align the MVI56-LTQ with the chassis guides and seat it firmly until the locking tabs engage. Reconnect serial cables to the correct ports. Ensure proper grounding and cable shielding.
Stage 4: Power-On & Testing
Restore chassis power. Verify LED status (Module Status, Backplane Transfer, Application, and Serial Activity). Download or verify the ladder-logic configuration and active slave table. Test communication with one or more valves, confirming position feedback and command execution before returning the system to automatic operation.
6. Firmware/Software Versions & Upgrade Notes
Configuration is performed primarily through ladder logic in the ControlLogix processor and the module’s internal setup. Always back up the existing ladder-logic routine and module configuration before replacement.
The module uses a fixed application image optimized for Limitorque protocol handling. Do not attempt to load firmware or configuration files intended for other MVI56 modules (for example, MCM or DNP versions). After installation, verify the active slave table, polling scheme, baud rate, and timeout parameters match the original system requirements. Incorrect settings can result in communication timeouts or loss of valve control.
7. Frequently Asked Questions (FAQ)
Is this module new or refurbished?
This is Brand New Surplus / Original New. It has never been installed in a chassis and is not a repaired or rebuilt unit.
Why is the price different from current list or used units?
New Surplus pricing reflects the cost of locating genuine unused inventory of a specialized, limited-availability module. It is typically lower than full manufacturer list while remaining higher than used modules that carry unknown residual life.
How many valves can the MVI56-LTQ support?
The module supports storage and transfer of data for up to 150 Limitorque-compatible valves.
Can I hot-swap this module in a ControlLogix chassis?
No. Always power down the chassis and follow proper lock-out/tag-out procedures before removal or insertion.
Does the module require special software?
Primary configuration is handled through RSLogix 5000 / Studio 5000 ladder logic. A configuration cable is used for initial setup and diagnostics via the CFG port.
What is the main risk of installing a used or refurbished module?
Refurbished units may contain aged components or previous communication stress that is not externally visible. Failure after installation can interrupt valve control and cause extended process downtime.
What warranty is provided?
New Surplus units typically carry a 1 year warranty covering defects in materials and workmanship under normal industrial operating conditions.
