VF701S1 YOKOGAWA

VF701S1 Yokogawa Input module

Brand：Yokogawa Model number：VF701S1

Country of origin: Japan Product weight：0.55kg

HS code：8538900000

Product Details：

Product Dimensions：

The VF701S1 interface card serves as the physical and logical bridge connecting PC-based stations to Yokogawa's dedicated V net control bus. It handles real-time data transmission, command routing, and system synchronization across the distributed automation architecture. Featuring dual-redundant communication channels, the module continuously monitors link integrity and automatically switches to the backup path if a failure is detected on the active channel, ensuring uninterrupted process visualization and control. It fits directly into a standard PCI slot of compatible Yokogawa industrial computer hardware, offloading network communication tasks from the main host processor to maintain high system responsiveness.

Product Parameters

Module Type: V net Interface Card for PCI bus systems.
Compatibility: Yokogawa CENTUM VP, CENTUM CS 3000, and associated field control stations or human interface stations.
Bus Interface: Standard PCI bus slot connector.
Network Protocol: Yokogawa proprietary V net control network protocol.
Transmission Speed: 10 Mbps real-time deterministic communication rate.
Network Redundancy: Dual-redundant bus support with dual coaxial cable connections (Bus A and Bus B).
Connector Type: Dual BNC connectors for coaxial cable interface.
Power Supply: Supplied directly via the host computer PCI slot bus (typically 5 VDC).
Operating Temperature Range: 0°C to 50°C (32°F to 122°F).
Operating Humidity Range: 20% to 80% relative humidity, non-condensing.
LED Indicators: Front panel status lights for power, system run, fault diagnostics, and transmit/receive activity for both channels.

Product Advantages

A primary advantage of the VF701S1 is its exceptional reliability in mission-critical process environments, provided by native dual-redundant V net channel support.

Its deterministic communication architecture ensures microsecond-level synchronization and guaranteed latency for urgent control signals and process alarm notifications.

By offloading network protocol handling directly onto onboard microprocessors, the card prevents host CPU overload during peak network traffic conditions.

Seamless integration with Yokogawa system diagnostic tools allows operators to monitor network health, cable integrity, and signal quality in real time from the engineering workstation.

Important Considerations and Precautions

When installing and maintaining the VF701S1 module, technicians must observe strict electrostatic discharge (ESD) precautions by wearing a grounded wrist strap to protect internal circuitry from static damage.

The card must be fully powered down by shutting down the host system before insertion or removal from the PCI slot to avoid electrical arcing or bus corruption.

Proper 75-ohm coaxial cable impedance, quality BNC connectors, and correct bus termination resistors are strictly required across the V net loop to prevent signal reflection and data loss.

Bending radius limits for coaxial cables must be respected during installation to avoid physical damage to the internal shielding and conductors.

Ensure that the host computer's cooling fans and ventilation paths remain clear, as elevated cabinet temperatures can lead to operational drift or hardware degradation.

Product Applications

The VF701S1 module is widely deployed across continuous and batch automation industries that depend on Yokogawa DCS infrastructure.

Oil and Gas Refining: Connecting human interface stations to central control units for real-time monitoring of distillation towers, crackers, and storage facilities.
Chemical and Petrochemical Processing: Maintaining continuous, high-speed data flow between reactor controllers, safety instrumented systems, and engineering stations.
Power Generation Facilities: Interfacing boiler, turbine, and auxiliary control systems in fossil fuel, combined-cycle, and nuclear power plants.
Pharmaceutical Manufacturing: Supporting high-reliability data acquisition and batch record logging across regulated production environments.
Water and Wastewater Treatment: Enabling reliable control communication between central monitoring stations and remote treatment process nodes.

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