The Yokogawa SNT501 is an Optical ESB Bus Repeater Slave Module used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS).
It works together with a master module (such as SNT401 / SNT411) to extend ESB bus communication via optical fiber, enabling long-distance, high-reliability data transmission between safety controllers and distributed I/O nodes.
As the slave-side module, SNT501 is typically installed at the remote end of an ESB communication segment, making it essential for large distributed safety architectures.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Yokogawa |
| Model | SNT501 |
| Product Type | Optical ESB Bus Repeater (Slave) |
| System Compatibility | ProSafe-RS / ESB bus architecture |
| Function | Optical ESB signal reception & transmission |
| Pairing Module | SNT401 / SNT411 (Master) |
| Network Type | ESB optical fiber communication |
| Topology | Star / Chain connection |
| Max Connection Stages | 2 stages |
| Transmission Distance | Up to 5 km (10 km in extended configurations) |
| Current Consumption | ~0.5 A |
| Power Supply | 24 V DC (typical configuration) |
| Data Rate | Up to ~1 Mbps |
| Operating Temperature | -20°C to +70°C (ISA G3 class) |
The SNT501 provides optical transport functionality for ESB bus communication, ensuring stable signal transmission over long distances.
Physical Characteristics
| Item | Specification |
|---|---|
| Dimensions (W × H × D) | Approx. 32.8 × 130 × 142.5 mm |
| Weight | Approx. 0.3 kg |
| Mounting Type | Rack / optical repeater unit (e.g., SNT10D) |
| Structure | Optical repeater slave module |
| Installation | SIS control cabinet |
Recommended Related Models
- Yokogawa SNT401 – Optical ESB Bus Repeater Master
- Yokogawa SNT411 – Advanced optical ESB master module
- Yokogawa SNT10D – Optical repeater rack unit
- Yokogawa SNB10D – Safety node unit
- Yokogawa SEC401 / SEC402 – ESB bus coupler modules
Popular Yokogawa Models
- Yokogawa SNT501 – optical ESB slave module
- Yokogawa SNT401 – ESB master repeater module
- Yokogawa SNT411 – long-distance optical ESB module
- Yokogawa NFCP100 – communication processor
- Yokogawa CENTUM VP – DCS platform
