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- Yokogawa
- VF702
- Control Bus Interface Card
- Japan
- 22 mm × 126.5 mm × 193.54 mm
- 0.15kg
- Xiamen, China
- New & In Stock
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Product Overview – VF702
The VF702 is a control‑bus interface card designed to connect Yokogawa control / automation / distributed control system (DCS) components to a coaxial bus (10BASE‑2) network or to act as an interface between the internal high‑speed PCI‑Express bus and legacy / specialized control bus lines. It provides reliable data transmission over coaxial cable, supports long run distances, and is suitable for industrial automation systems where signal integrity and compatibility with older bus protocols matter.
It is intended for environments where interface between PC/processing chassis and field or control modules using coaxial bus is required. The VF702 card offers compatibility, backwards support, and bandwidth suitable for control‑system monitoring, status signals, and supervisory functions.
Technical Specifications – VF702
| Parameter | Specification / Typical Value |
|---|---|
| Model | VF702 |
| Module Type | Control Bus Interface Card |
| Purpose / Function | Interface between PCI‑Express and 10BASE‑2 coaxial control bus (YCB146 cable) |
| Physical Interface | Coaxial cable (model YCB146), T‑type connector, BNC connector |
| Transmission Standard | 10BASE‑2 (coaxial Ethernet style) |
| Maximum Cable Distance | 185 meters (when using proper 10BASE‑2 coaxial cable) |
| PCI‑Express Interface | CEM specification 1.0a, x1 link width, 2.5 GT/s signaling |
| Slot Compatibility | Can be inserted in PCI‑Express slots x1 up to x16 (not usable in PCI) |
| Power Supply Voltage | 3.3 V DC ± 9% |
| Current Consumption | Up to about 2.4 A |
| Weight | 0.15 kg (excluding T‑type connector) |
| Dimensions (Width × Height × Depth) | 22 mm × 126.5 mm × 193.54 mm |
| Operating Temperature | Approx. ‑20 °C to +70 °C |
| Protection / EMC / Compliance | EMC standards (CE, C‑Tick markings etc.), regulatory compliance for interface cards |
| Indicators | Receive (RCV), Send (SND) lamps / LEDs to show bus activity |
Applications
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Bridging internal computation units (PCI‑Express based controllers) with legacy coaxial 10BASE‑2 control buses.
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Used in distributed control systems (DCS) where some field or control modules still use coaxial cable for communication.
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Monitoring and supervisory control networks in plants (chemical, petrochemical, power, utilities) where older bus standard remains in part of the system.
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Engineering / commissioning tools requiring interface to 10BASE‑2 buses for diagnostics or data capture.
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Environments needing physical interface for bus repeaters, analysis, or maintaining backward compatibility during migration to newer networks.
Key Advantages
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Compatibility with older coaxial 10BASE‑2 bus networks, allowing continued use of existing infrastructure.
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PCI‑Express interface gives direct connection to controller/processor boards, with high‑speed link (x1, 2.5 GT/s).
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Ability to handle long coaxial cable runs (up to ~185 m) maintaining signal integrity.
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Low power consumption relative to signal duty; moderate current draw (≈2.4 A) at low voltage (3.3 V).
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Compact width (22 mm) saves slot space; relatively lightweight (0.15 kg) makes handling easier.
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Visual indicators (Send / Receive) help in troubleshooting and diagnosing bus activity.
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Support for EMC / CE / regulatory requirements ensures suitability in industrial plants.
Brand & Series
| Field | Description |
|---|---|
| Brand | Yokogawa |
| Product Series | Control Bus / Interface Cards / Vnet / Legacy Bus Interface family |
| Category | Communication Interface / Bus Interface |
| System Compatibility | DCS, Automation Control, Supervisory Systems |
| Use Case | Legacy bus connectivity, supervisory bus communication |
Related / Similar Models (Same Series or Related Interfaces)
Here are five models of similar type (bus interface, coaxial or network cards) useful for comparing or alternative selection:
| Model | Description / Function | Dimensions (mm) | Weight (kg) | Key Notes |
|---|---|---|---|---|
| VF701 | Similar interface card with perhaps different connector or variant | ~22 × 126.5 × 193.5 | ~0.15 | May support slightly different cable / connector types |
| VI702 | Network interface card for Vnet/IP or Ethernet networks | ~110 × 90 × 40 | ~0.6 | Used where newer network standards are used instead of coax |
| VC401‑10 | Coupler / coupler card in Vnet series | ~100 × 68 × 26 | ~0.2 | Coupling modules; more modern network interface |
| SSB401‑53 | ESB Bus Interface Slave module | ~110 × 22.5 × 100 | ~0.2 | For safety bus rather than legacy coaxial interfaces |
| SPW482‑53 | Power supply / node supply module | ~99 × 22.5 × 114 | ~0.34 | Provides power to cards or nodes including interface cards |
Popular Models from Same Brand (Yokogawa)
Here are five widely used modules from Yokogawa in related contexts (interfaces, I/O, power, logic). Useful to compare or choose when designing a system.
| Model | Function / Use Case | Dimensions (mm) | Weight (kg) | Highlights |
|---|---|---|---|---|
| SCP451‑53 | Analog Output Module (4 channels) | ~123 × 122 × 100 | ~1.5 | For analog control outputs |
| SEC401‑51 | Discrete Input Module | ~123 × 30 × 100 | ~0.18 | For alarm or status inputs |
| SSB401‑53 | ESB Bus Interface Slave module | ~110 × 22.5 × 100 | ~0.2 | Safety bus communications |
| SPW482‑53 | Dual Output Power Supply Module | ~99 × 22.5 × 114 | ~0.34 | Powers node and field devices |
| CP701 | Control / Logic Processor Module | larger rack card | ~1.7 | Central logic, more processing power |
FAQ (10 Questions & Answers)
Q1: What does VF702 do in a control system?
A1: It acts as a bridge between a PCI‑Express based control/processor board and a legacy coaxial 10BASE‑2 control bus, enabling data exchange and communication over the coax bus.
Q2: What cable type and maximum length does it support?
A2: It supports coaxial cable per 10BASE‑2 standard (with T‑type / BNC connectors), up to about 185 meters.
Q3: What power voltage does the card require?
A3: 3.3 V DC with a tolerance (±9%).
Q4: How much current does VF702 draw?
A4: Up to about 2.4 A.
Q5: What are the physical dimensions and mass of the module?
A5: Approximately 22 mm width × 126.5 mm height × 193.54 mm depth, and weighing about 0.15 kg (excluding certain connectors).
Q6: What slot types can this card be installed in?
A6: It can be used in PCI‑Express slots of width ×1 up through ×16 (physically compatible), but not in standard PCI slots.
Q7: What are the environmental operating conditions?
A7: It operates typically between ‑20 °C and +70 °C, meeting ambient industrial environment specs, and has EMC compliance via CE, C‑Tick etc.
Q8: What are the indicator LEDs for?
A8: Indicators such as “RCV” show reception activity on the control bus; “SND” show transmission / send activity, assisting diagnostics.
Q9: Is VF702 used for safety‑critical functions?
A9: It is an interface card; whether it forms part of a safety‑certified loop depends on the overall system design. It supports necessary standards for industrial automation, but its safety role must be defined in system context.
Q10: Can VF702 be used with long‑distance coaxial bus segments?
A10: Yes, up to ~185 m under proper 10BASE‑2 coaxial cable conditions with correct connectors. Beyond that, signal integrity may degrade.
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