Description
Product Name: MVI71-MCM Allen Braley Output module
Product details:
The Allen-Bradley MVI71-MCM is a Modbus Master/Slave Network Interface Module manufactured by ProSoft Technology for the Allen-Bradley PLC-71 series (or compatible PLC-5 systems). It serves as a communication bridge, allowing these legacy controllers to interface with Modbus RTU/ASCII devices.
1. Product Description
The MVI71-MCM is a single-slot solution that fits directly into a PLC-5 or 71-series rack. It enables the processor to act as a Modbus Master or a Modbus Slave. This is particularly useful for integrating newer field devices (like power meters, drives, or sensors) into older industrial control systems without needing complex custom ladder logic for serial communication.
2. Technical Specifications
| Feature | Specification |
| Module Type | Modbus Communication Module (MCM) |
| Platform | Allen-Bradley PLC-5 / 71-Series |
| Communication Ports | 2 Serial Ports (PRT1 & PRT2) |
| Port Types | RS-232, RS-422, or RS-485 (Jumper selectable) |
| Protocols Supported | Modbus RTU and Modbus ASCII |
| Baud Rates | 110 to 115,200 bps |
| Data Functions | Read/Write up to 100 commands per port |
| Internal Database | 5000 registers for data exchange |
| Backplane Current Load | 800 mA @ 5 VDC |
3. Product Advantages
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Ease of Integration: It uses standard I/O data transfer (BTR/BTW) to move data between the module and the PLC processor, minimizing the need for complex programming.
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Dual Port Versatility: The two ports operate independently. You can configure Port 1 as a Master and Port 2 as a Slave simultaneously.
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Legacy Support: It provides a reliable way to extend the life of PLC-5 systems by connecting them to modern Modbus-enabled hardware.
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No Special Software: Configuration is primarily done through a simple text file or via the PLC ladder logic, requiring no proprietary configuration software.
4. Key Considerations & Precautions
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Power Consumption: Ensure your rack’s power supply can handle the 800mA draw, as this module is relatively power-hungry compared to standard I/O.
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Jumper Settings: Before installation, you must manually set the physical jumpers on the module to define whether you are using RS-232, RS-422, or RS-485.
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Data Mapping: Users must carefully map the 5,000-word internal database to the PLC’s integer files (N files) to avoid data overwriting.
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Termination: For RS-485 networks, ensure proper termination resistors are used at the end of the cable runs to prevent signal reflection.
5. Product Applications
The MVI71-MCM is widely used in industries such as Oil & Gas, Water/Wastewater, and Manufacturing. Typical use cases include:
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SCADA Connectivity: Acting as a Modbus Slave to provide PLC data to a third-party SCADA system.
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Field Device Aggregation: Collecting data from multiple Modbus devices (e.g., Variable Frequency Drives, Temperature Controllers, and Flow Meters) and bringing that data into the PLC-5.
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Power Monitoring: Interfacing with electrical trip units and power quality meters to monitor energy consumption.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
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Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
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