Technical Overview
The Yokogawa SB401 functions as a bus interface slave module for the CENTUM VP and ProSafe-RS distributed control systems. This module connects field control units (FCUs) to I/O nodes using the ESB bus with a 10 Mbps data transfer rate. Its compact design measures 130 x 40 x 110 mm and weighs just 0.55 kg, saving valuable cabinet space. The SB401 supports up to 64 nodes, making it suitable for large-scale process control networks.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | Bus Interface Slave Module |
| System Compatibility | CENTUM VP, ProSafe-RS |
| Communication Protocol | ESB bus |
| Transmission Speed | 10 Mbps |
| Topology | Daisy-chain / Tree |
| Maximum Cable Length | 100 m (per segment) |
| Maximum Nodes | 64 |
| Scan Cycle | 10 ms |
| Redundancy | Dual-redundant (hot-standby) |
| Failover Time | ≤ 2 seconds |
| Power Supply | 5 VDC (from backplane) |
| Current Draw | 300 mA |
| Diagnostic LEDs | RUN, ERR, COM, ACT |
| 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 |
Communication and Network Architecture
The Yokogawa SB401 operates as a slave device on the ESB bus, transferring data between the FCU and distributed I/O modules. Its daisy-chain topology allows simple cabling, while the tree topology provides flexibility for large installations. Additionally, the 10 ms scan cycle ensures deterministic data exchange for time-critical control loops.
Redundancy and Fault Tolerance
This bus interface module supports dual-redundant configurations, enabling automatic failover to the standby unit without process interruption. The SB401 continuously monitors the communication path and switches within 2 seconds when it detects a fault. This high availability makes it suitable for continuous processes such as refining, chemical production, and power generation.
Integration and Diagnostics
The SB401 mounts directly onto the CENTUM VP or ProSafe-RS backplane, simplifying system assembly and expansion. LED indicators provide immediate visual feedback for communication and error conditions. With its compact form factor and low power consumption, the module offers a space-efficient solution for ESB bus connectivity.
Details
| Weight | 0.55 kg |
|---|---|
| Dimensions | 130 × 40 × 110 mm |
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