The Yokogawa SSB401‑53 is an ESB Bus Interface Slave Module, engineered as part of Yokogawa’s ProSafe‑RS safety instrumented system. Operating as a trusted communication node, it ties safety node units (e.g., SNB10D) into the redundant ESB high-speed safety bus. Its robust design meets the IEC 61508 standard, supports hot-swapping, and is optimized for high-dependability environments.

Product Specifications

Note: Net and shipping weight are derived from multiple vendor sources.

Applications

The SSB401‑53 is widely utilised in mission-critical safety applications:

• Process Safety Control – integrating safety nodes into central ESB bus for process industries.

• Fire & Gas Systems – enabling fault-redundant control channels.

• Machinery Protection – safeguarding turbine, compressor, or critical spinning assets.

• Emergency Shutdown (ESD) – serving in fail-safe signal paths with high integrity.

• Plant Safety Networks – employed in chain or star ESB topologies, possibly extended >5 km using optical repeaters.

Advantages

• Redundant ESB Bus Mapping – supports resilient network topologies for non-stop safety.

• Hot‑Plug Capability – facilitates maintenance without full-system shutdown.

• Compliance with Safety Standards – IEC 61508 ensures SIL-level reliability.

• Wide Operating Range – ‑20 °C to +70 °C, with IP65 rating for harsh environments.

• Scalable Integration – accommodates chain or star configurations, extendable via optical repeaters up to 50 km.

FAQs

1. What differentiates SSB401-53 from SSB401‑13?

   It’s a direct replacement – same functionality but enhanced suffix (“‑53”) indicating ISA G3 compliance.

2. What power input does it use?

   Powered via 24 V DC from the ESB bus, with ~10 W consumption.

3. Can it be plugged or removed while powered?

   Yes — supports hot‑swap for easy servicing.

4. What is the max cable distance?

   Up to 1 km over copper bus; up to 50 km using optical repeaters.

5. Operating temperature and humidity rating?

   ‑20 °C to +70 °C and 5 %–95 % (non‑condensing).

6. Is it explosion‑proof?

   “‑5” indicates standard (non‑explosion‑proof), “‑3” suffix includes ISA G3 & temp spec.

7. What’s the module’s weight and size?

   Net0.45 kg; size 130 x 142.5 x 32.8mm.

8. Does it meet any safety standards?

   Yes — compliant with IEC 61508 (ProSafe‑RS).

9. Warranty period?

   Typically comes with a 12-month warranty.

10. What delivery times should I expect?

    Generally in stock, ships in 7–10 business days.