The Yokogawa SNT511-13 is an Optical ESB Bus Repeater Slave Module used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS).
It functions as the slave-side optical communication interface in ESB bus networks, working with a master module such as SNT401 / SNT411 to extend ESB communication over optical fiber for long-distance, high-reliability industrial control systems.
This module is widely used in distributed safety architectures where stable and redundant communication between controllers and remote I/O nodes is required.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Yokogawa |
| Model | SNT511-13 |
| Product Type | Optical ESB Bus Repeater (Slave) |
| System Compatibility | ProSafe-RS / ESB bus architecture |
| Function | Optical ESB signal reception & retransmission |
| Pairing Module | SNT401 / SNT411 (Master side) |
| Network Type | ESB optical fiber communication |
| Topology | Star / Chain connection |
| Max Connection Stages | 2 stages |
| Transmission Distance | Up to 5 km per segment, up to ~50 km in multi-stage systems |
| Data Rate | High-speed ESB communication (up to ~128 Mbps in system-level specs) |
| Weight | Approx. 0.3 kg |
| Dimensions | Approx. 32.8 × 130 × 142.5 mm |
| Operating Temperature | -20°C to +70°C (ISA G3 class) |
| Power Supply | 24 V DC (system dependent) |
System Role
The SNT511-13 acts as the remote-side optical ESB repeater node.
Typical architecture:
-
ESB Bus from controller (SSC / SCS / SEC401 systems)
→ SNT401 / SNT411 (Master)
→ Optical fiber link
→ SNT511-13 (Slave)
→ Remote safety node / I/O system
This enables long-distance deterministic communication in safety-critical industrial systems.
Recommended Related Models
- Yokogawa SNT401 / SNT401-53 / SNT401-E3 – Master modules
- Yokogawa SNT411 – advanced ESB optical master
- Yokogawa SNT501 / SNT511 – other slave variants
- Yokogawa SNT10D – ESB repeater rack unit
- Yokogawa SNB10D – safety node unit
