Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SNT411-13 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Optical ESB Bus Repeater Master Module |
| System Compatibility | Yokogawa ProSafe-RS Safety Instrumented System |
| Function | Electrical ESB signal conversion to optical fiber transmission |
| Communication Interface | ESB Bus optical repeater interface |
| Transmission Speed | 128 Mbps |
| Transmission Distance | 5 km to 50 km over optical fiber paths |
| Maximum Connection Stages | Up to 2 stages |
| Network Topology | Star, Chain, or mixed topology |
| Optical Connector | LC optical connector, IEC 61754-20 compliant |
| Fiber Type | Single-mode quartz optical fiber, 2 cores |
| Current Consumption | 0.5 A |
| Weight | Approx. 0.3 kg |
| Dimensions | Approx. 32.8 mm x 130 mm x 142.5 mm |
| Power Consumption | Approx. 12 W at rated supply conditions |
Process Control Optical Isolation and Communication Features
The SNT411-13 converts ESB electrical signals into optical signals to support extended communication distances between Safety Control Units and remote Safety Node Units. The optical transmission path provides galvanic isolation between connected system sections and reduces the influence of electromagnetic interference.
The module supports dual-redundant configurations through paired installation slots. Therefore, the ProSafe-RS architecture can maintain communication paths with separated optical channels.
The module operates with Yokogawa process control communication structures and applies channel-to-channel isolation concepts to maintain signal separation. In addition, the optical interface supports stable data transmission between SSC60D / SSC50D Safety Control Units and SNB10D or N-IO nodes.
Frequently Asked Questions
Q: What type of optical fiber does the SNT411-13 require?
A: The SNT411-13 requires a 2-core single-mode quartz optical fiber connection with LC optical connectors.
Q: Can the SNT411-13 operate in a redundant configuration?
A: Yes. The module supports dual-redundant installation using dedicated paired slots for redundant ESB communication paths.
Q: Does the SNT411-13 support different ESB network topologies?
A: Yes. The module supports Star, Chain, and mixed ESB optical network configurations.
Field Installation Guidelines
- Install the SNT411-13 in the designated Yokogawa ProSafe-RS ESB or node mounting slots according to the system hardware configuration.
- Use approved single-mode optical fiber cables and maintain correct LC connector alignment during installation.
- Separate optical communication wiring from high-voltage power cables and strong electromagnetic interference sources.
- Check optical fiber routing before commissioning to prevent excessive bending or mechanical stress.
- Confirm redundant module slot allocation when implementing dual-redundant ESB communication structures.
- Verify grounding and cabinet bonding practices for associated electrical ESB equipment before system operation.
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