The Yokogawa SNT501-53 S1 is an Optical ESB Bus Repeater Slave Module used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS).
It works with a master module (such as SNT401 / SNT411) to extend ESB bus communication over optical fiber networks, enabling long-distance, noise-immune data transmission between safety controllers and remote I/O nodes.
The suffix “-S1” indicates a specific configuration variant within the SNT501-53 family, typically related to hardware option / interface / mounting or system revision differences, while maintaining the same core ESB optical repeater function.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Yokogawa |
| Model | SNT501-53 S1 |
| Product Type | Optical ESB Bus Repeater (Slave) |
| System Compatibility | ProSafe-RS SIS |
| Function | Optical ESB signal reception & retransmission |
| Pairing Module | SNT401 / SNT411 |
| Network Type | ESB optical fiber communication |
| Topology | Star / Chain |
| Max Connection Stages | 2 stages |
| Transmission Distance | Up to 5 km per segment (system dependent) |
| Data Rate | Up to 1 Mbps |
| Power Supply | 24 V DC |
| Current Consumption | ~0.5 A |
| Operating Temperature | -20°C to +70°C (ISA G3 class) |
Physical Characteristics
| Item | Specification |
|---|---|
| Dimensions (W × H × D) | Approx. 142.5 × 130 × 32.8 mm |
| Weight | Approx. 0.3 kg – 3 kg (depending on packing / vendor listing) |
| Mounting Type | Rack / ESB repeater system (e.g., SNT10D cabinet) |
| Structure | Optical slave repeater module |
| Installation | SIS control cabinet |
System Role
The SNT501-53 S1 acts as the remote-side optical ESB repeater node.
Typical architecture:
-
ESB Bus from controller (SEC401 / SSB401 / SSC system)
→ SNT401 / SNT411 (Master)
→ Optical fiber link
→ SNT501-53 S1 (Slave)
→ Remote safety node / I/O system
This structure enables stable long-distance distributed safety system communication.
Recommended Related Models
- Yokogawa SNT401 / SNT401-53 / SNT401-E3 – Master side modules
- Yokogawa SNT411 – advanced ESB optical master
- Yokogawa SNT501 / SNT501-53 – standard slave versions
- Yokogawa SNT10D – rack repeater unit
- Yokogawa SNB10D – safety node unit
