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- Yokogawa
- SNT401-53
- 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 SNT401-53 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-reliability communication between safety controllers and distributed safety nodes.
The “-53” suffix typically indicates a configured version of the SNT401 series that supports specific environmental and system-grade requirements for industrial SIS communication networks.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNT401-53 |
| Product Type | Optical ESB Bus Repeater Main Module |
| System Platform | ProSafe-RS SIS |
| Function | ESB electrical-to-optical signal conversion and extension |
| Communication Type | Fiber Optic ESB Bus |
| Mounting Type | Rack-mounted (19-inch system) |
| Dimensions | 142.5 × 130 × 32.8 mm |
| Weight | 0.3 kg |
| System Role | Master-side optical repeater module |
| Configuration | Works with SNT501 slave module |
Function and Working Principle
The SNT401-53 functions as a communication bridge between electrical ESB bus and fiber optic transmission lines.
Main functions:
- Converts ESB electrical signals into optical signals
- Extends communication distance in SIS architectures
- Maintains data integrity in noisy industrial environments
- Supports redundant and distributed safety networks
- Enables flexible plant-wide communication topology
System Flow
Safety Controller / SNB10D Node → ESB Bus → SNT401-53 → Fiber Optic Cable → SNT501 → Remote Safety Node
System Role
The SNT401-53 acts as the master-side optical repeater unit in Yokogawa ESB communication architecture. It is typically installed in central or control-side cabinets to interface with:
- Safety controllers
- ESB bus coupler modules
- Distributed safety node systems
It enables safe and reliable communication across long distances in large industrial plants.
Industrial Applications
- Oil & gas production facilities
- Petrochemical and refinery plants
- Offshore platforms and FPSO systems
- 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 ESB extension
- System grounding and EMC shielding required
- Must follow ESB network topology design rules
Compatible Components
- SNT501 Optical ESB Bus Repeater Slave Module
- SNB10D Safety Node Units
- SEC401 / SEC402 ESB Bus Coupler Modules
- SSB401 ESB Interface Modules
- ProSafe-RS safety controllers
- Fiber optic communication cables
Alternative / Related Models
- SNT401 (standard version)
- SNT401-13
- SNT10D repeater unit system
- SNT501 slave module
- SEC series ESB coupler modules
Key Advantages
- Enables long-distance ESB communication
- High immunity to electromagnetic interference
- Supports fiber optic industrial networking
- Suitable for large distributed SIS systems
- Flexible star and chain topology design
- Critical component for plant-wide safety integration
FAQ
Q: Is SNT401-53 a controller or CPU?
No, it is a communication repeater module, not a processing unit.
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 paired with an SNT501 slave module.
Conclusion
The Yokogawa SNT401-53 Optical ESB Bus Repeater Main Module is a key communication component in ProSafe-RS safety systems. It enables reliable optical extension of ESB networks, supporting scalable and high-integrity distributed safety architectures in industrial environments.