Description

Yokogawa SNT411-13 Optical ESB Bus Repeater Master Module

The Yokogawa SNT411-13, also cataloged as the SNT411-13 Optical ESB Bus Repeater Master Module, operates as a dedicated hardware component for optical transport of ESB Bus signals within ProSafe-RS Safety Instrumented System networks. It converts electrical ESB signals to optical form to enable long-distance connection between safety control units and remote safety node modules.

Hardware Specifications

Parameter	Specification
Model / Brand	Yokogawa SNT411-13
Origin	Japan
Weight	Approx. 0.3 kg
Dimensions	32.8 mm × 130 mm × 142.5 mm
OperatingTemp	Not specified
PowerConsumption	0.5 A
Function	ESB Bus optical transport
Connection Method	Star type, Chain type
Number of Connecting Stages	Maximum two
Transmission Distance	5 km to 50 km (total for two stages)
Module Type	Optical ESB Bus Repeater (Master)

ProSafe-RS Optical Transport and Safety Isolation

The SNT411-13 provides optical isolation between the master and slave ESB Bus nodes, eliminating ground loop issues and EMI interference. It supports high-speed real-time data handling up to 128 Mbps and can operate in star, chain, or mixed topologies. The module is compatible with dual-redundant network configurations and maintains signal integrity across maximum two connection stages with a total optical path up to 50 km.

Frequently Asked Questions

Q: Can the SNT411-13 module be replaced while the system is operational?
A: Hot-swap is supported only when deployed within redundant ProSafe-RS network configurations to avoid interruption to safety functions.

Q: What is the maximum supported distance for optical transmission?
A: The module can extend optical ESB Bus communication up to 50 km across two connection stages.

Q: Which network topologies are supported for connection?
A: The module supports star-type, chain-type, and mixed star/chain connections.

Field Installation Guidelines

• Mount the module in a Yokogawa-compatible safety rack using standard single-slot allocation.
• Ensure optical fibers are properly terminated and cleaned before connection to prevent signal attenuation.
• Maintain recommended fiber routing to avoid sharp bends and mechanical stress.
• Confirm electrical ESB Bus cabling is grounded and shielded where necessary before optical conversion.
• Verify link integrity and attenuation levels between master and slave modules to prevent receiver saturation.
• Install in a controlled environment with ventilation for passive cooling; avoid enclosed high-temperature zones.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems