ABB 1VCF751021R802 MODBUS Board | 24VDC Communication Interface

ABB 1VCF751021R802 MODBUS Communication Board - Industrial Protocol Interface Solution

The ABB 1VCF751021R802 MODBUS Board delivers reliable serial communication capabilities for industrial automation systems requiring MODBUS RTU/ASCII protocol integration. Engineered for 24 VDC operation with extended temperature tolerance from -10°C to +60°C, this communication interface enables seamless data exchange between PLCs, drives, HMIs, and SCADA systems in demanding manufacturing environments.

Technical Specifications

• Power Supply: 24 VDC nominal
• Protocol Support: MODBUS RTU, MODBUS ASCII
• Operating Temperature: -10°C to +60°C
• Communication Interface: RS-485 serial port
• Baud Rate: 1200 to 115200 bps (configurable)
• Data Bits: 7 or 8 bits
• Parity: None, Even, Odd
• Stop Bits: 1 or 2
• Mounting: DIN rail or panel mount
• Protection: Galvanic isolation, surge protection
• LED Indicators: Power, TX, RX, Error status

Industrial Applications

This MODBUS interface board excels in factory automation networks, building management systems, energy monitoring installations, and process control architectures. Deploy it to connect legacy MODBUS devices with modern control systems, integrate third-party sensors and actuators, or establish multi-drop communication networks across production lines. The board's robust isolation protects sensitive equipment from electrical noise and ground loop interference common in industrial settings.

Integration Solutions

Configuration is streamlined through DIP switches or software utilities, allowing rapid setup of slave addresses, baud rates, and protocol parameters without specialized programming. The board supports up to 247 MODBUS slave devices on a single network segment, making it ideal for distributed I/O architectures and multi-zone monitoring applications. Galvanic isolation up to 2500 VAC ensures safe operation in electrically noisy environments while maintaining signal integrity across extended cable runs up to 1200 meters.

Common Technical Questions

Q: What is the maximum cable distance for RS-485 communication?
A: The board supports RS-485 networks up to 1200 meters (approximately 4000 feet) at lower baud rates. For distances exceeding 500 meters, use baud rates of 19200 bps or lower to ensure reliable communication.

Q: Can this board function as both master and slave?
A: The 1VCF751021R802 typically operates as a MODBUS slave device. For master/client functionality, verify your specific application requirements with our technical team as configuration options may vary.

Q: How many devices can connect to one board?
A: When configured as a master, the board can communicate with up to 247 MODBUS slave devices on the same RS-485 network segment, limited by addressing range and network loading.

Q: What termination is required for RS-485 networks?
A: Install 120-ohm termination resistors at both physical ends of the RS-485 bus to prevent signal reflections. Many installations use switchable termination for flexible network topology.

Warranty & Technical Support

Each ABB 1VCF751021R802 MODBUS Board is backed by a comprehensive 12-month warranty covering manufacturing defects and component failures. Our engineering team provides configuration assistance, network troubleshooting, protocol analysis support, and integration guidance to ensure successful deployment in your automation infrastructure.

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