ProSoft Technology MVI56E-MCMR – Enhanced Modbus Master/Slave Communication Module | ControlLogix Platform
Engineering Background: The MVI56E-MCMR is ProSoft Technology’s enhanced-generation Modbus Master/Slave communication module engineered specifically for the Rockwell Automation ControlLogix backplane. It supersedes the legacy MVI56-MCMR, delivering expanded memory, faster scan rates, and a built-in web-based configuration interface — eliminating the need for a separate PC-based configuration tool in most deployment scenarios.
Product Positioning: Designed for procurement engineers and system integrators who require a proven, drop-in Modbus gateway within an existing ControlLogix architecture. The MVI56E-MCMR bridges Modbus RTU/ASCII serial networks — including legacy field instruments, drives, meters, and RTUs — directly into the ControlLogix tag database, enabling seamless SCADA and DCS integration without additional middleware.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | MVI56E-MCMR |
| Manufacturer | ProSoft Technology |
| Platform | Rockwell Automation ControlLogix (1756 series) |
| Protocol | Modbus RTU / Modbus ASCII — Master & Slave (simultaneous) |
| Serial Ports | 2 × RS-232 / RS-422 / RS-485 (software-selectable) |
| Master Sessions | Up to 2 Modbus Master sessions |
| Slave Sessions | Up to 2 Modbus Slave sessions |
| Max Nodes per Port | 247 slave devices per port |
| Data Memory | 5,000 registers (input) + 5,000 registers (output) |
| Backplane Interface | ControlLogix 1756 backplane (any slot) |
| Configuration Interface | Built-in web server (Ethernet port) + RSLogix 5000 / Studio 5000 AOI |
| Ethernet Port | 10/100 Mbps (configuration & diagnostics only) |
| Baud Rate | 110 bps – 115,200 bps |
| Power Consumption | 800 mA @ 5 VDC (from backplane) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Humidity | 5% – 95% non-condensing |
| Certifications | UL, CE, RoHS |
| Weight | Approx. 1,900 g (module + packaging) |
| Firmware | Field-upgradeable via Ethernet |
| Successor To | MVI56-MCMR (legacy, discontinued) |
Proven Application Environments
- Oil & Gas: Integrating Modbus RTU flow computers, pressure transmitters, and RTUs into ControlLogix-based SCADA systems.
- Power Generation & Utilities: Connecting legacy Modbus energy meters and protection relays to modern DCS/SCADA platforms.
- Water & Wastewater: Bridging Modbus-enabled pumps, drives, and analyzers into ControlLogix control networks.
- Manufacturing & Process: Integrating third-party Modbus drives (VFDs), temperature controllers, and weighing systems.
- Building Automation: Linking Modbus HVAC controllers and energy management systems to ControlLogix supervisory layers.
- Mining & Metals: Harsh-environment serial device integration where Modbus RTU remains the dominant field protocol.
Engineering Advantages
- Dual Master + Dual Slave simultaneously: Supports concurrent Master and Slave operation on both ports — a critical advantage for multi-master architectures.
- Enhanced web configuration: Browser-based setup eliminates dependency on legacy ProSoft Configuration Builder software for initial commissioning.
- AOI-based integration: Pre-built Add-On Instructions (AOIs) for Studio 5000 / RSLogix 5000 reduce engineering hours significantly.
- Expanded data table: 5,000 input + 5,000 output registers — double the capacity of the legacy MVI56-MCMR.
- Firmware field-upgradeable: Ethernet-based firmware updates eliminate module removal during maintenance windows.
- Diagnostic transparency: Real-time port statistics, error counters, and message logs accessible via web browser without interrupting production.
System Architecture & Signal Flow
The MVI56E-MCMR occupies a standard 1756 ControlLogix slot and communicates with the ControlLogix CPU via the high-speed backplane. On the field side, two independently configurable serial ports connect to Modbus RTU or ASCII devices. Data flows bidirectionally: the module polls Modbus slave devices (Master mode) and simultaneously responds to external Modbus master queries (Slave mode), mapping all data into the ControlLogix tag database through the AOI interface.
Typical signal path: Field Modbus Device ↔ RS-485/RS-232 Serial Port ↔ MVI56E-MCMR Internal Buffer ↔ 1756 Backplane ↔ ControlLogix CPU Tag Database ↔ SCADA/HMI
Sourcing & Quality Verification
- All MVI56E-MCMR units sourced through verified industrial automation supply channels.
- Each module undergoes visual inspection, label verification, and functional power-on check prior to shipment.
- Original OEM packaging, firmware version, and serial number documentation provided upon request.
- Traceability records maintained for every unit — available for audit by procurement and quality teams.
- Counterfeit-risk mitigation: units are cross-referenced against ProSoft Technology’s published part number and firmware databases.
Procurement Process
- Submit RFQ: Contact [email protected] with your required quantity, delivery timeline, and any project-specific documentation requirements.
- Quotation: Receive a formal quotation with unit price, lead time, and shipping options within 1 business day.
- Order Confirmation: Purchase order accepted via email. Payment terms available for qualified accounts.
- Inspection & Dispatch: Module inspected, documented, and dispatched with tracking information.
- After-Sales Support: Technical support available post-delivery for installation and commissioning queries.
Technical FAQ
Q: Is the MVI56E-MCMR backward-compatible with the legacy MVI56-MCMR?
A: Yes. The MVI56E-MCMR is a direct slot-for-slot replacement for the MVI56-MCMR. Updated AOIs are required in Studio 5000 to leverage enhanced features, but the physical backplane interface and wiring are identical.
Q: Can both serial ports operate as Modbus Master simultaneously?
A: Yes. Each port can be independently configured as Master or Slave, allowing Port 1 as Master and Port 2 as Slave (or both as Masters) concurrently.
Q: Does the module support Modbus TCP?
A: No. The MVI56E-MCMR supports Modbus RTU and Modbus ASCII over serial (RS-232/422/485) only. For Modbus TCP, refer to the ProSoft MVI56E-MNET module.
Q: What ControlLogix chassis and firmware versions are supported?
A: Compatible with all 1756 ControlLogix chassis. Recommended with RSLogix 5000 v16+ or Studio 5000 v21+. Verify ProSoft’s compatibility matrix for specific CPU firmware revisions.
Q: Is a ProSoft Configuration Builder (PCB) license required?
A: Not for basic configuration. The built-in web server handles most configuration tasks. PCB remains available for advanced offline configuration and backup.
Q: What is the typical lead time for in-stock units?
A: In-stock units ship within 1–3 business days. Contact us for current availability and expedited shipping options.
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