The PROSOFT FMVI94 MCM (Modbus Communication Module) is a network interface controller designed by ProSoft Technologies (USA) specifically for Rockwell Automation Flex I/O systems, such as the 1769 Flex I/O. Its core function is to bridge Modbus communication protocols—both serial and Ethernet—with the Rockwell ControlLogix backplane, enabling seamless data exchange between Modbus devices and Rockwell controllers.
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Key Specifications
Model: FMVI94 MCM (Flex I/O Modbus Communication Module)Compatible Backplane: 1769 Flex I/O backplane (single-slot 1794)Electrical Specifications:Backplane Current Draw: 20 mABackplane Voltage: 5V
External Power Supply: 12V – 24V DC
Operating Temperature: 0°C – 55°C
Storage Temperature: -40°C – 85°C
Communication Protocols: Modbus RTU (serial) and Modbus TCP (Ethernet)
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Product Features
Powerful Protocol Bridging: Allows Flex processors to easily communicate with Modbus-enabled devices such as VFDs, temperature controllers, pressure sensors, and host systems.Flexible Master/Slave Modes: Supports both Modbus Master and Slave configurations to meet diverse field requirements.Industrial-Grade Reliability:Compliance with industrial electrical safety standards, with strong anti-interference and EMC performance.Some models support Ex ia intrinsically safe certification.
Highly stable operation with a built‑in high‑precision digital signal processor for accurate and reliable data acquisition.
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Structure and Components
Form Factor: Standard 1794 backplane slot design, directly pluggable into the Flex I/O backplane.
Interfaces:
Modbus Communication Port: RS‑485 for Modbus RTU or RJ45 Ethernet for Modbus TCP.
Power Interface: 5V from the backplane, with optional external 12–24V DC power supply.
Internal Circuitry: Industrial-grade components with overcurrent and overvoltage protection.
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Application Areas
Industrial Automation Control: Connects PLCs with field devices such as sensors, actuators, and VFDs.Data Acquisition Systems: Collects real-time data from multiple Modbus devices and transmits it to host systems for monitoring and analysis.Remote Monitoring and Control: Enables remote status monitoring and parameter configuration via Modbus networks.Multi-Vendor System Integration: Serves as a data bridge in mixed-brand environments (e.g., Siemens, Mitsubishi) and other fieldbus systems.————————————————————————————————————————————————
Installation and Maintenance
Installation:Insert the FMVI94 MCM into any available slot on the 1769 Flex I/O backplane (1794 slot).Connect RS‑485 or Ethernet cables to the corresponding Modbus devices or network.Ensure stable backplane power or connect an external power supply as required.
Maintenance:Periodically check for loose terminals and stable backplane voltage.Configure module parameters using Rockwell Studio 5000 software, ensuring correct protocol and address settings.Monitor communication status bits (e.g., error flags) through the PLC program for quick fault diagnosis.
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