ProSoft MVI56-MCM Modbus Communication Module | Replacement, Equivalent & Selection Guide
The MVI56-MCM is a ProSoft Technology Modbus Master/Slave communication module designed for the Allen-Bradley ControlLogix platform. It enables seamless Modbus RTU/ASCII integration into ControlLogix backplanes, making it a critical component in industrial automation and process control systems. This page serves as a comprehensive selection, replacement, and compatibility reference for B2B buyers and system integrators.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | MVI56-MCM |
| Manufacturer | ProSoft Technology |
| Platform | Allen-Bradley ControlLogix (1756 series) |
| Protocol | Modbus RTU / Modbus ASCII |
| Port Count | 2 × RS-232/RS-422/RS-485 configurable ports |
| Master/Slave | Both supported simultaneously |
| Max Registers | Up to 5,000 registers per port |
| Backplane Current | 800 mA @ 5 VDC |
| Operating Temp | 0 °C to 60 °C (32 °F to 140 °F) |
| Certifications | UL, CE, cUL |
| Form Factor | Single-slot ControlLogix module |
| Weight | Approx. 0.3 kg |
Compatible Replacement & Equivalent Models
When the MVI56-MCM is discontinued, out of stock, or cost-prohibitive, the following alternatives are commonly evaluated:
| Model | Manufacturer | Protocol | Notes |
|---|---|---|---|
| MVI56E-MCM | ProSoft Technology | Modbus RTU/ASCII | Enhanced version with Ethernet config port — direct upgrade |
| MVI56-MNET | ProSoft Technology | Modbus TCP/IP | Ethernet-based Modbus; use when migrating to TCP network |
| 1756-MVI | Spectrum Controls | Modbus RTU | Third-party ControlLogix Modbus module |
| DNETEXT-2C | Hilscher | Multi-protocol | Gateway approach for mixed-protocol environments |
| HMS AnyBus X-Gateway | HMS Networks | Modbus RTU ↔ EtherNet/IP | Protocol converter; suitable for legacy device integration |
Note: Always verify firmware version, backplane slot compatibility, and RSLogix 5000 / Studio 5000 AOI availability before substituting modules.
Why Choose the Original MVI56-MCM
- Proven field reliability — widely deployed in oil & gas, water treatment, and manufacturing since 2000s
- Dual-port flexibility — simultaneous master and slave operation on two independent serial ports
- Native ControlLogix integration — uses ProSoft’s Add-On Instructions (AOI) for rapid commissioning
- Extensive documentation — ProSoft provides full user manuals, sample ladder logic, and technical support
- Long installed base — spare parts and refurbished units remain available through authorized distributors
Typical Applications
- Connecting legacy Modbus RTU field devices (meters, drives, sensors) to ControlLogix PLCs
- SCADA integration where Modbus is the plant-floor protocol standard
- Oil & gas wellhead and pipeline monitoring systems
- Water/wastewater SCADA with mixed Modbus device networks
- Building automation and energy management systems
- Retrofit projects migrating from SLC-500 / PLC-5 to ControlLogix
System Compatibility
- PLC Platform: Allen-Bradley ControlLogix 1756 series (all chassis sizes)
- Software: RSLogix 5000 / Studio 5000 v16 and above
- Firmware: Compatible with ControlLogix L6x and L7x processors
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supply: Standard 1756-Pxx series power supplies
Selection Guide
Use the following decision matrix to select the right Modbus module for your ControlLogix system:
| Requirement | Recommended Model |
|---|---|
| Serial Modbus RTU/ASCII, legacy wiring | MVI56-MCM (this product) |
| Serial Modbus + Ethernet config access | MVI56E-MCM |
| Modbus over Ethernet/TCP network | MVI56-MNET |
| Multi-protocol gateway requirement | HMS AnyBus X-Gateway |
| Budget-sensitive retrofit project | Refurbished MVI56-MCM (contact us) |
Quality Assurance & Sourcing
- All MVI56-MCM units sourced through authorized or verified secondary-market channels
- Each unit undergoes functional verification prior to shipment
- Original firmware and factory configuration preserved where applicable
- Packaging includes original accessories (cables, documentation) when available
- Traceable lot documentation available on request for regulated industries
How to Order
- Confirm your ControlLogix chassis model and available slot count
- Verify your Studio 5000 / RSLogix 5000 version for AOI compatibility
- Select quantity and contact us for volume pricing or lead-time inquiry
- Provide your shipping address — we support worldwide export from China
- Payment via T/T, PayPal, or trade-term arrangements (FOB Xiamen)
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Replacement & Compatibility FAQ
Q: Is the MVI56E-MCM a drop-in replacement for the MVI56-MCM?
A: Yes, the MVI56E-MCM is backward-compatible and uses the same AOI structure. The primary difference is the addition of an Ethernet configuration port.
Q: Can the MVI56-MCM work with CompactLogix?
A: No. The MVI56-MCM is designed exclusively for the ControlLogix 1756 backplane. For CompactLogix, consider the MVI46-MCM or MVI69-MCM.
Q: What is the maximum baud rate supported?
A: Up to 115,200 bps on each serial port.
Q: Do you provide the ProSoft AOI and sample code?
A: Yes, we can provide links to ProSoft’s official documentation and sample Studio 5000 projects upon request.
Q: Is a refurbished unit covered by warranty?
A: We offer a 90-day functional warranty on all refurbished units. New units carry the original manufacturer warranty.
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