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Yokogawa VF702 Control Bus Interface Card

The Yokogawa VF702, also cataloged as the VF702 Control Bus Interface Card, operates as a dedicated hardware component for high-speed deterministic bus communications within CENTUM DCS networks.

Hardware Specifications

Parameter Specification
Model VF702
Brand Yokogawa
Origin Japan
Weight 2.0 kg
Dimensions Standard Yokogawa card slot enclosure
Operating Temp 0 to 55 deg C
Power Consumption 5 VDC, 0.8 A (Internal Backplane)
Interface Type Control Bus Interface Card
Physical Connector BNC Connector
Cable Connection Coaxial Cable with Model YCB146, T-Type Connector
Transmission Standard 10BASE-2 Compliant
Ingress Protection IP20

Process Control and DCS Connectivity

Configured for Yokogawa CENTUM systems, the VF702 module maintains physical signal integrity over 10BASE-2 coaxial media using BNC interconnects with YCB146 T-connectors. Channel-to-channel isolation prevents ground loop interference across distributed field nodes. Integrated cold junction compensation circuit pathways stabilize high-density analog loop transfers, guaranteeing reliable HART, FOUNDATION Fieldbus, and process bus telemetry performance under severe electromagnetic conditions.

Frequently Asked Questions

Q: How does the VF702 establish connection with the CENTUM control bus?

A: The card utilizes a standard BNC connector configured for 10BASE-2 compliant coaxial networking via a Yokogawa Model YCB146 T-type connector.

Q: What are the grounding requirements for the coaxial interface on the VF702?

A: The coaxial shield must be grounded at a single point through the YCB146 assembly to eliminate ground loops while preserving high-frequency noise immunity.

Field Installation Guidelines

Mount the VF702 vertically into the designated CENTUM node chassis slot until the rear backplane connectors fully engage. Secure retaining screws to guarantee continuous chassis ground continuity. When running 10BASE-2 coaxial cables, maintain a minimum bending radius of 50 mm to avoid dielectric degradation. Terminate both physical cable ends with standard 50-ohm BNC terminators. Route communication cabling away from high-voltage AC motor leads or variable frequency drive cables to mitigate EMI noise.

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