SNT401-53 Yokogawa Optical ESB Bus Repeater

SNT401-53 Yokogawa ProSafe-RS Optical ESB Bus Repeater

SNT401-53 Yokogawa ProSafe-RS Optical ESB Bus Repeater

Availability: 10 left in stock

Yokogawa SNT401-53 Optical ESB Bus Repeater Module The Yokogawa SNT401-53, also cataloged as the SNT401 Optical ESB Bus Repeater Master...

SKU: SNT401

Manufacturer: Yokogawa
Product No.: SNT401
Product Type: Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa SNT401-53 Optical ESB Bus Repeater Module

The Yokogawa SNT401-53, also cataloged as the SNT401 Optical ESB Bus Repeater Master Module, operates as a dedicated hardware component for converting ESB bus electrical signals into optical signals within ProSafe-RS safety systems.

Suffix Breakdown & Model Matrix

The suffix breakdown specifies environmental ratings and connector configurations for the SNT401 series:

SNT401: Optical ESB Bus Repeater Master Module
-5: Standard type with no explosion protection
3: ISA Standard G3 conformal coating and extended operating temperature (-20 deg C to +70 deg C)
/CU1N: Connector unit for ESB Bus (without bus terminator)
/CU1T: Connector unit for ESB Bus (with built-in bus terminator)

Hardware Specifications

Parameter	Specification
Model	SNT401-53
Brand	Yokogawa Electric Corporation
Origin	Japan
Weight	0.3 kg
Dimensions	32.8 x 142.5 x 130 mm
Operating Temp	-20 deg C to +70 deg C
Power Consumption	0.5 A (from 5 VDC chassis backplane)
Transmission Medium	Optical fiber cable
Maximum Distance	5 km per stage (10 km maximum across dual-stage topologies)
System Compatibility	ProSafe-RS Safety Control Units, Safety Node Units, N-IO nodes
Network Topology	Star or chain topologies

4-20 mA HART Loop Protocol & Channel-to-Channel Isolation

The SNT401-53 master module enables long-distance optical transport for safety instrumented functions while maintaining galvanic channel-to-channel isolation between electrical rack backplanes. By converting copper-based ESB signals to optical signals, the module isolates 4-20 mA HART loop protocol instruments and safety interlocks from high-voltage surges, ground potential shifts, and severe electromagnetic interference across distributed nodes.

Frequently Asked Questions

Q: Can the SNT401-53 module be installed in any arbitrary slot within a ProSafe-RS safety rack?

A: No. The SNT401-53 follows specific slot pairing rules for duplex configurations. Technicians must install duplex modules in adjacent continuous odd/even slot pairs to allow internal backplane redundancy synchronization.

Q: What is the main structural difference between the /CU1N and /CU1T connector options?

A: The /CU1N option serves as an inline connection unit without an internal bus termination resistor, whereas the /CU1T incorporates an integrated terminator for installation at the physical endpoint of an electrical ESB segment.

Field Installation Guidelines

Mount the SNT401-53 module vertically into the designated safety node rack slot, ensuring the top and bottom latch levers lock into place to establish frame ground continuity. Fasten the selected /CU1N or /CU1T connector unit onto the front interface using the integral retention screws. Connect clean optical LC fiber patches to the transceiver ports, ensuring cable bend radii do not fall below the manufacturer minimum threshold to avoid signal attenuation. Keep protective dust covers on all unused optical interfaces during cabinet wiring.

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