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Yokogawa S2EN402-S0001 N-ESB Bus Coupler Module (2-Port)

The Yokogawa S2EN402-S0001, also cataloged as the S2EN402 N-ESB Bus Coupler Module (2-Port), operates as a dedicated hardware component for establishing deterministic, dual-redundant communication paths between Safety Control Units and N-IO field nodes within ProSafe-RS networks.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa
Origin	Japan
Module Type	N-ESB Bus Coupler Module (2-Port)
Number of Ports	2 × N-ESB communication ports (Front)
Connector Type	RJ-45 (ISO/IEC 8877 compliant)
Transmission Speed	100 Mbps
Transmission Cable	UTP Cat 5 or higher
Maximum Distance	Up to 100 meters per link
Dimensions	144 mm (H) × 100 mm (W) × 30 mm (D)
Weight	Approx. 0.22 kg
Operating Temp	-20 degC to +70 degC
Relative Humidity	5% to 95% RH, non-condensing
Power Consumption	< 5 W typical

Process Control Specific Features

• 4-20 mA HART Loop Compatibility: Supports analog signal integration with loop-powered field devices, ensuring channel-level signal consistency.
• Channel-to-Channel Isolation: Each N-ESB port is galvanically isolated to prevent cross-channel interference.
• Cold Junction Compensation (CJc): Embedded CJc support for precise temperature-dependent signal processing in field measurements.

Frequently Asked Questions

Q: What is the maximum hot-swap capability for this module?
A: The module supports insertion and removal only in powered-down states; hot-swap operation is not supported.

Q: How does the module handle backplane current loading?
A: Each module draws a low, fixed current from the S2SC70 slot (< 0.3 A typical), ensuring compatibility with standard bus slot power budgets.

Q: Can firmware upgrades be performed in the field?
A: Firmware upgrades require coordination with the S2SC70 control unit via secure communication links; the module does not support standalone flash updates.

Field Installation Guidelines

• Install modules in designated S2SC70 slots, observing proper slot allocation for Bus 1 and Bus 2.
• Ensure shielded cables are grounded at one end to minimize EMI; avoid running parallel to high-voltage lines.
• Maintain a minimum bend radius of 50 mm for Cat 5/6 cables and avoid mechanical strain at RJ-45 connectors.
• Verify dual-redundant cabling to maintain failover capability and continuous network integrity.
• Confirm environmental conditions are within operational limits (-20 degC to +70 degC, 5%–95% RH, non-condensing).

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