Modbus Serial Communication Solution – ProSoft MVI56-MCM | MVI56 Series
Where This Product Is Used
The ProSoft MVI56-MCM is deployed across demanding industrial environments where legacy Modbus serial devices must integrate seamlessly with Allen-Bradley ControlLogix PLCs. Typical deployment sites include:
- Oil & Gas Facilities – RTU polling, flow computers, and wellhead controllers communicating via Modbus RTU/ASCII over RS-232/485
- Water & Wastewater Treatment Plants – SCADA integration with pumps, drives, and analyzers using Modbus serial protocols
- Power Generation & Utilities – Substation automation linking protective relays and meters to ControlLogix controllers
- Manufacturing & Assembly Lines – Connecting variable frequency drives (VFDs), servo drives, and HMI panels via Modbus
- Building Automation Systems (BAS) – Energy meters, chillers, and HVAC controllers integrated into centralized PLC control
- Chemical & Pharmaceutical Plants – Process instrumentation (transmitters, analyzers) with Modbus output linked to safety-rated ControlLogix systems
Technical Specifications
- Part Number: MVI56-MCM
- Series: MVI56 (ControlLogix Platform)
- Protocol: Modbus Master & Slave (RTU and ASCII modes)
- Serial Ports: 2 × configurable RS-232 / RS-422 / RS-485
- Baud Rate: 110 bps – 115,200 bps
- Max Modbus Nodes: Up to 247 slave devices per port
- Backplane Interface: Allen-Bradley ControlLogix 1756 backplane
- Data Transfer: Up to 5,000 registers (input/output) via backplane
- Power Consumption: 800 mA @ 5 VDC (from backplane)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Humidity: 5% to 95% non-condensing
- Dimensions: Standard 1756 single-slot module
- Certifications: UL Listed, CE Marked, cUL
- Configuration Tool: ProSoft Configuration Builder (PCB) – free download
Why Engineers Specify This Model
- Dual-Port Flexibility: Two independently configurable serial ports allow simultaneous Master and Slave operation, reducing module count and panel space
- Proven Interoperability: Tested with hundreds of Modbus device types including Schneider, Siemens, ABB, and Yokogawa instruments
- High Register Capacity: 5,000-register data table eliminates bottlenecks in data-intensive SCADA applications
- Non-Intrusive Installation: Plug-in ControlLogix module with no special cabling to the controller – backplane communication only
- Free Configuration Software: ProSoft Configuration Builder simplifies setup with drag-and-drop command lists and built-in diagnostics
- Long Product Lifecycle: ProSoft maintains long-term availability and firmware support for MVI56 series modules
Complete System Bill of Materials
For a complete Modbus integration system using the MVI56-MCM, engineers typically specify:
- MVI56-MCM – Modbus Communication Module (this item)
- 1756-A7 or 1756-A13 – ControlLogix Chassis (7 or 13 slot)
- 1756-L71 or 1756-L73 – ControlLogix L7x Controller
- 1756-PA72 – ControlLogix AC Power Supply
- 1756-EN2T – EtherNet/IP Communication Module (for remote I/O or HMI)
- RS-485 shielded twisted-pair cable (Belden 9841 or equivalent)
- DB9 to terminal block adapter (for RS-232 field wiring)
- ProSoft Configuration Builder (PCB) software – free from ProSoft
Compliance & Industry Standards
- UL 508 – Industrial Control Equipment
- CE Marking – EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- cUL – Canadian Standards (CSA C22.2)
- Modbus.org – Compliant with official Modbus Application Protocol Specification V1.1b3
- RoHS Compliant – Restriction of Hazardous Substances Directive
- ATEX / IECEx – Consult factory for hazardous location variants
Quality Assurance & Sourcing
Konmask.com sources the MVI56-MCM through verified industrial automation distributors and authorized supply channels. Every unit undergoes the following before shipment:
- Visual inspection for physical damage, label integrity, and firmware version verification
- Authenticity check against ProSoft Technology serial number database where applicable
- Anti-static packaging with humidity indicator cards for safe international transit
- Documentation package: datasheet, wiring diagram, and configuration guide included
We stock both new surplus and factory-new units. Condition is clearly stated on each listing. All units carry a minimum 12-month warranty against defects.
How to Source This Part
- Add to Cart – Click the purchase button above to place an order directly
- Request a Quote – Email support@konmask.com for volume pricing, lead time, or export documentation
- Urgent Orders – Call or WhatsApp +0086 19859288691 for same-day quotation and expedited shipping options
- Technical Pre-Sales – Our engineers can review your application and confirm compatibility before purchase
We ship worldwide via DHL Express, FedEx International, and UPS. Export documentation (commercial invoice, packing list, CO) provided for all international orders.
Application-Specific FAQ
Q: Can the MVI56-MCM act as both Modbus Master and Slave simultaneously?
A: Yes. Each of the two serial ports can be independently configured as Master or Slave, allowing the module to poll field devices on Port 1 while serving data to an upstream SCADA system on Port 2.
Q: Is the MVI56-MCM compatible with ControlLogix L8x controllers?
A: Yes, the MVI56-MCM is compatible with all ControlLogix 1756 chassis and controllers including L6x, L7x, and L8x series. Verify firmware compatibility with ProSoft’s compatibility matrix.
Q: What is the maximum cable length for RS-485 with this module?
A: RS-485 supports up to 1,200 meters (4,000 ft) at lower baud rates with proper termination resistors (120Ω) at each end of the bus.
Q: Does this module support Modbus TCP?
A: No. The MVI56-MCM is a serial Modbus module (RTU/ASCII). For Modbus TCP over Ethernet, specify the MVI56E-MCM or MVI56-MNET instead.
Q: Can I use this module in a hazardous (Class I, Div 2) location?
A: The standard MVI56-MCM is rated for general industrial environments. For Class I, Div 2 applications, consult Konmask or ProSoft for appropriate enclosure and installation requirements.
Q: What software is needed to configure the MVI56-MCM?
A: ProSoft Configuration Builder (PCB) is the free configuration tool. It runs on Windows and connects to the module via the ControlLogix backplane using RSLinx Classic or Studio 5000 Logix Designer.
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