Honeywell 10302/2/1 3400126 Watchdog Repeater

Configured for watchdog signal distribution and supervision in Honeywell FSC safety control systems, the Honeywell 10302/2/1 (10302/2/1 3400126 Watchdog Repeater) provides direct watchdog signal replication between power supply units, central parts, and I/O sections. The module supports watchdog current management and power supply monitoring functions required in redundant and mixed redundancy FSC configurations.

Hardware Specifications

Channel-to-Channel Isolation and Watchdog Distribution

The 10302/2/1 Watchdog Repeater is used to extend and distribute watchdog supervision signals within Honeywell FSC safety architectures. The module enables watchdog signal replication when system configurations exceed the capacity of a single watchdog source.

The repeater is required in multiple power supply configurations where additional 24 VDC to 5 VDC power supply units are installed beyond the primary supply. Typical applications include systems utilizing PSU 2, PSU 3, or PSU 4 configurations.

The module also provides watchdog signal handling for installations combining redundant and non-redundant I/O sections. In these architectures, the repeater generates watchdog outputs required for supervision of non-redundant output modules.

Redundant Power Supply and Safety System Integration

The 10302/2/1 is used when watchdog current requirements exceed 900 mA or when FSC architectures employ specific power supply arrangements requiring additional watchdog monitoring capability.

Applications include:

• Multiple PSU configurations utilizing additional 24 VDC to 5 VDC power supply units.

• M24-20 HE and M24-12 HE power supply installations requiring watchdog signal repetition.

• Power supplies capable of exceeding 31.0 VDC output, provided system design ensures the 24 VDC supply remains below 37 VDC under any single or double fault condition.

• Mixed redundancy architectures combining redundant central parts with non-redundant I/O sections.

• 5 VDC supervision applications where dedicated monitoring of the central power rail is required.

Frequently Asked Questions

Q: When is a Watchdog Repeater required in an FSC system?
A: The module is required for multiple PSU configurations, watchdog currents exceeding 900 mA, mixed redundancy architectures, and specific monitored power supply arrangements.

Q: Does the module generate process control signals?
A: No. The module is intended for watchdog distribution, supervision, and power monitoring functions within the FSC infrastructure.

Q: What input current is required for the watchdog inputs?
A: WDG1 and WDG2 inputs have a specified input current of 0.1 mA.

Field Installation Guidelines

• Verify compatibility with FSC software Version 3.00 or later before installation.

• Confirm rack coding and module coding requirements for positions A5 and A9.

• Ensure watchdog current calculations are completed before integrating multiple repeater paths.

• Verify proper 5 VDC and 24 VDC supply availability before energizing the module.

• Route watchdog signal wiring separately from high-current power conductors.

• Inspect all backplane and connector interfaces for correct mechanical engagement.

• Perform watchdog path verification and power supply supervision testing after installation.