Technical Overview
The Yokogawa SSB401-13 functions as a bus interface module for the CENTUM VP distributed control system. This module enables communication between field control units and I/O nodes through the ESB bus, which operates at a transmission speed of 10 Mbps. Its dual-redundant architecture supports failover switching within 2 seconds, ensuring continuous operation in critical applications. Consequently, the SSB401-13 provides reliable data exchange across the entire DCS network.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | Bus Interface Module |
| System Compatibility | CENTUM VP DCS |
| Communication Bus | ESB (Extended Serial Bus) |
| Transmission Speed | 10 Mbps |
| Bus Topology | Daisy-chain / Tree |
| Maximum Cable Length | 100 meters (per segment) |
| Number of Connected Nodes | Up to 64 |
| Scan Cycle | 10 ms |
| Redundancy | Dual-redundant (automatic failover) |
| Failover Time | ≤ 2 seconds |
| Power Supply | 24 VDC |
| Current Draw | 300 mA |
| Diagnostic LEDs | RUN, ALM, ACT, ERH |
| Dimensions (H x W x D) | 130 x 40 x 110 mm |
| Weight | 0.55 kg |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 70°C |
| Protection Class | IP20 |
| Certifications | CE, CSA, IEC 61508 |
Communication Bus Architecture
The Yokogawa SSB401-13 supports daisy-chain and tree topologies, providing flexibility when designing DCS network layouts. Its 100-meter maximum cable length per segment accommodates large plant installations with distributed I/O cabinets. The ESB bus protocol prioritizes real-time data traffic, ensuring deterministic scanning cycles of 10 milliseconds for time-sensitive control loops.
Redundancy and Fault Tolerance
Dual-redundant operation ensures seamless failover from active to standby modules without interrupting process control. The SSB401-13 performs automatic diagnostics on both communication paths, switching to the backup channel within 2 seconds upon detecting a fault. This high availability makes the module suitable for continuous processes such as refining, chemical production, and power generation.
Diagnostics and Module Integration
Front-panel LEDs provide immediate visual status for RUN, ALM, ACT, and ERH conditions, enabling rapid troubleshooting. The module mounts directly to the CENTUM VP backplane, requiring no additional adapters or configuration tools. With robust construction and wide operating temperature tolerance, the SSB401-13 delivers long-term reliability in harsh industrial environments.
Details
| Weight | 0.55 kg |
|---|---|
| Dimensions | 130 × 40 × 110 mm |
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