Technical Overview
The Yokogawa VF702 serves as a control bus interface card for the CENTUM VP distributed control system. This module provides high-speed communication between the field control unit (FCU) and I/O subsystems through the ESB bus, which runs at 10 Mbps. Its dual-redundant architecture ensures automatic failover without interrupting process control, making it suitable for critical continuous operations. The VF702 also integrates diagnostic LEDs for RUN, ERR, and COM status to facilitate real-time monitoring.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | Control Bus Interface Card |
| System Compatibility | CENTUM VP |
| Communication Protocol | ESB (Extended Serial Bus) |
| Transmission Speed | 10 Mbps |
| Cable Type | Dedicated ESB cable |
| Maximum Cable Length | 100 meters (per segment) |
| Topology | Daisy-chain / Tree |
| Number of Connected Nodes | Up to 64 |
| Scan Cycle | 10 ms |
| Redundancy | Dual-redundant (hot-standby) |
| Failover Time | ≤ 2 seconds |
| Power Supply | 5 VDC (from backplane) |
| Current Draw | 400 mA |
| Diagnostic LEDs | RUN, ERR, COM, ACT |
| Dimensions (H x W x D) | 130 x 40 x 110 mm |
| Weight | 0.35 kg |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 70°C |
| Protection Class | IP20 |
| Certifications | CE, CSA |
Communication Architecture and Network Topology
The Yokogawa VF702 connects the FCU to remote I/O nodes through the ESB bus, supporting daisy-chain or tree topologies. Its 100-meter cable length per segment accommodates large plant layouts with distributed I/O cabinets, while the 10 ms scan cycle ensures deterministic data exchange for high-speed control loops. Furthermore, this interface card enables expansion up to 64 nodes, providing scalability for growing automation needs.
Redundancy and Fault Tolerance
Dual-redundant operation ensures seamless failover from active to standby modules without any interruption to process data flow. The Yokogawa VF702 automatically detects communication faults and switches to the backup path within 2 seconds, maintaining system integrity during hardware failures. This high availability makes the module essential for refining, chemical, and power generation applications.
Diagnostics and System Integration
The VF702 provides instant visual feedback through front-panel LEDs for RUN, ERR, COM, and ACT conditions, enabling rapid troubleshooting. The module mounts directly to the CENTUM VP backplane, requiring no additional configuration tools. With its compact dimensions and low current consumption, the interface card offers an efficient and reliable solution for ESB bus connectivity.
Details
| Weight | 0.35 kg |
|---|---|
| Dimensions | 130 × 40 × 110 mm |
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