Honeywell 10302/2/1 Watchdog Repeater Module

The Honeywell 10302/2/1 12600, also cataloged as the 10302/2/1 Watchdog Repeater Module, monitors the 5 VDC and 24 VDC supply voltages for I/O modules in Honeywell safety control systems. It provides a watchdog output to monitored output modules and supports power supply monitoring in multiple-PSU configurations, mixed redundant and non-redundant I/O arrangements, and systems requiring additional watchdog current capacity.

Hardware Specifications

Watchdog Output and Power Supply Monitoring

The 10302/2/1 monitors the designated I/O power supply voltages and connects its watchdog output to the watchdog inputs of the corresponding output modules. Installation is required in specific configurations:

• Multiple power supply units: One repeater is required for each subsequent 24 VDC to 5 VDC power supply unit, such as PSU 2, PSU 3, or PSU 4.
• Specified power supplies: Required when 24 VDC is supplied through an M24-20 HE or M24-12 HE power supply.
• Elevated supply voltage: Required when the 24 VDC source can exceed 31.0 VDC. The supply output must remain below 37 VDC under single- or double-fault conditions.
• High watchdog current: Required when the watchdog current demand exceeds 900 mA.
• Mixed I/O redundancy: Generates the watchdog output for non-redundant output modules in configurations combining redundant and non-redundant I/O.
• Redundant Central Parts: Supports 5 VDC monitoring in configurations with redundant Central Parts and non-redundant I/O when 5 VDC monitoring is otherwise absent.

The module requires a horizontal bus connection. Rack space must be reserved at positions 1, 2, or 11-18 as applicable to the rack configuration. Each repeater must be installed in the same I/O section as the output modules it monitors.

Frequently Asked Questions (FAQ)

Q: Can the 10302/2/1 be replaced while the power supply is energized?

A: Yes. The module can be exchanged with the power supply switched on. However, the Central Part will shut down during the exchange. In configurations with redundant Central Parts and non-redundant I/O, both Central Parts will shut down.

Q: Which connector and rack positions does the module require?

A: It uses a male DIN 41612 Type F connector with the d, b, and z rows. It requires a horizontal bus connection and occupies 4 TE x 3 HE (4 HP x 3U). Rack positions must be allocated according to the applicable I/O rack configuration.

Q: What are the module's power supply requirements?

A: The module draws 35 mA from the 5 VDC supply, excluding WDROUT output current, and 25 mA from the 24 VDC supply. The combined WDG1 and WDG2 input current is 0.1 mA.

Field Installation Guidelines

• Verify rack compatibility and reserve the required 4 HP x 3U mounting space before installation.
• Confirm that the horizontal bus connection is available at the intended rack position.
• Check module and rack key coding. The module uses holes A5 and A9, while the rack uses large pins at A5 and A9.
• Install the repeater in the I/O section containing the output modules it monitors. Do not use a repeater installed in one I/O section to control another section.
• Verify the 5 VDC and 24 VDC supply conditions and account for WDROUT output current when calculating the total 5 VDC load.
• For 24 VDC supplies that may exceed 31.0 VDC, verify that the maximum output remains below 37 VDC under single- or double-fault conditions.
• Follow the system manufacturer's approved replacement procedure. Energized replacement can cause the Central Part or both Central Parts to shut down, depending on system configuration.
• Verify connector alignment and engage the backplane connector without applying excessive mechanical force.