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- Yokogawa
- SNT401
- Optical Bus Repeater Main Module
- Japan
- 142.5 x 130 x 32.8 mm
- 0.3 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa SNT401 is an Optical ESB Bus Repeater Main Module used in ProSafe-RS Safety Instrumented Systems (SIS). It is designed to convert electrical ESB bus signals into optical signals, enabling long-distance, high-integrity communication between safety controllers and distributed safety nodes.
The SNT401 works as the master-side repeater module in an optical ESB communication pair, typically used together with an SNT501 slave module to extend system communication via fiber optic cables.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNT401 |
| Product Type | Optical ESB Bus Repeater Main Module |
| System Platform | ProSafe-RS SIS |
| Function | ESB bus optical signal conversion and extension |
| Communication Type | Optical ESB Bus |
| Mounting Type | 19-inch rack mounted |
| Dimensions | 142.5 x 130 x 32.8 mm |
| Weight | 0.3 kg |
| Operating Role | Master-side optical repeater module |
| System Compatibility | ProSafe-RS safety systems |
Function and Working Principle
The SNT401 operates as a communication conversion module within a safety network.
Main functions:
- Converts ESB bus electrical signals into optical signals
- Extends ESB communication distance using fiber optic cables
- Maintains data integrity in distributed safety systems
- Supports star and chain network topologies
- Works in combination with SNT501 slave module
System Flow
Safety Controller / SNB10D Node → ESB Bus → SNT401 → Fiber Optic Cable → SNT501 → Remote Safety Node
System Role
The SNT401 serves as the master-side optical interface in Yokogawa safety communication architecture.
It is typically used to:
- Extend communication between remote SIS nodes
- Connect distributed safety cabinets
- Improve noise immunity in industrial environments
- Enable large-scale plant safety system design
Industrial Applications
- Oil & gas production facilities
- Petrochemical plants
- Refinery systems
- Offshore platforms
- Power generation stations
- Chemical processing industries
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Fire & Gas detection systems
Installation Notes
- Installed in standard 19-inch control racks
- Requires pairing with SNT501 slave module
- Fiber optic cabling required for communication link
- Must follow ESB network design rules
- Proper grounding required for system stability
Compatible Components
- SNT501 Optical ESB Bus Repeater Slave Module
- SNB10D Safety Node Units
- SEC401 / SEC402 ESB bus coupler modules
- ProSafe-RS safety controllers
- Fiber optic communication cables
Alternative / Related Models
- SNT501 (slave module counterpart)
- SNT10D (repeater unit housing system)
- SEC401 / SEC402 ESB couplers
- SNB10D safety node series
Key Advantages
- Enables long-distance ESB communication
- High noise immunity using fiber optics
- Supports large-scale distributed SIS architecture
- Flexible network topologies (star / chain)
- Reliable operation in harsh industrial environments
- Essential for multi-cabinet safety system design
FAQ
Q: Is SNT401 a controller?
No. It is a communication repeater module, not a control processor.
Q: What is its main function?
It converts ESB electrical signals into optical signals for long-distance transmission.
Q: Does it work alone?
No. It must be used with an SNT501 slave module.
Conclusion
The Yokogawa SNT401 Optical ESB Bus Repeater Main Module is a key communication component in distributed safety systems, enabling reliable optical extension of ESB bus networks for large-scale ProSafe-RS SIS architectures.