Technical Functional Summary
The SNT401-13 is a high-performance optical interface module designed for Yokogawa ESB (Extended Serial Bus) architectures. It converts electrical ESB signals into optical signals, enabling long-distance communication between control stations and remote I/O nodes.
The module is typically used in Safety Control Stations (SCS) and Field Control Stations (FCS) to extend communication distance while providing complete electrical isolation, eliminating ground loops and reducing electromagnetic interference (EMI) in industrial environments.
Detailed Engineering Specifications
| Parameter | Specification |
|---|---|
| Module Type | Optical ESB Bus Repeater Master |
| Model | SNT401-13 |
| Fiber Type | Single-mode fiber (SMF) |
| Communication Distance | Up to ~50 km (depends on fiber quality and slave module) |
| Dimensions | 2.2 cm × 12.4 cm × 12.6 cm |
| Weight | 0.3 kg |
| Data Conversion | ESB electrical signal → Optical pulse signal |
| Redundancy Support | Dual-redundant installation supported |
Operational Application
-
Remote I/O networking across geographically distributed plant areas
-
Hazardous environment isolation using fiber optics for explosive or high-EMI zones
-
Control system expansion for ProSafe-RS and CENTUM architectures while maintaining deterministic timing performance
Technical FAQ
How is SNT401-13 different from ANT401 series?
SNT401-13 is primarily used in safety and control station ESB architectures, while ANT401 series modules are typically ESB bus optical repeaters used in other system layers. Compatibility with backplanes must be verified before installation.
Does it require a connector unit?
Yes. It is usually paired with connector units such as SNT10D for fiber termination and interface connection.
Can single-mode and multi-mode fiber be mixed?
No. The module is designed exclusively for single-mode fiber optical wavelengths. Using multi-mode fiber will cause excessive signal attenuation and communication failure.
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