Honeywell 10302/2/1 Watchdog Repeater (WDR) Module

   The watchdog repeater 10302/2/1 is a module that monitors the 5 Vdc and 24 Vdc supplied to the I/O modules. The watchdog output of the watchdog repeater is connected to the watchdog input of those output modules whose power supply (5 Vdc and/or 24 Vdc) is monitored.
   A watchdog repeater is required in the following cases:
· in multiple-PSU configurations, for each subsequent 24 Vdc to 5 Vdc power supply unit, e.g. PSU 2, 3, 4.
· if the 24 Vdc is supplied via an M24-20 HE or M24-12 HE power supply.
· if the 24 Vdc is supplied via a power supply which can provide supply voltages that exceed 31.0 Vdc. (The maximum output voltage of the 24 Vdc supply must be less than 37 Vdc under any single or double fault condition of the 24 Vdc power supply unit.)
· if the required watchdog current exceeds 900 mA.
· in configurations which combine redundant and non-redundant I/O in order to create the watchdog output for the output modules of the non-redundant I/O part.
· in configurations with redundant Central Parts and non-redundant I/O, in order to monitor the 5 Vdc power supply (if no 5 Vdc monitoring is done).

   The watchdog repeater requires a horizontal bus connection. This means that space must be reserved in the I/O racks (positions 1, 2, 11-18).
   A watchdog repeater must always be placed in the I/O section whose output modules are monitored by that watchdog repeater. This means that watchdog repeaters in configurations with multiple (redundant) I/O sections may not be installed in such a way that they control the "other" I/O section.
   The watchdog repeater may be exchanged with the power supply switched on, but the Central Part will shut down, or both Central Parts will shut down if used in a configuration with redundant Central Parts and non-redundant I/O.
   The watchdog repeater is fitted with a male connector according to DIN 41612, type F, with the 'd', 'b' and 'z' rows used.

   The Honeywell 10302/2/1 Watchdog Repeater is widely used in safety instrumented systems within oil and gas, chemical processing, and power generation facilities. In these environments, multiple power supply units and distributed I/O are common. The WDR ensures continuous monitoring of both 5 Vdc and 24 Vdc supplies feeding critical output modules, enabling rapid detection of power faults. By correctly driving watchdog inputs, it helps force outputs to a safe state when abnormal supply conditions occur, supporting compliance with stringent safety and reliability requirements.

   The Honeywell 10302/2/1 Watchdog Repeater provides reliable monitoring of both 5 Vdc and 24 Vdc power supplies used by I/O modules. By repeating the watchdog signal to output modules, it ensures that any abnormal power condition is detected immediately and acted upon. This is especially important in systems with multiple power supply units, high watchdog current demands, or mixed redundant and non-redundant I/O configurations. Its precise monitoring capability helps prevent uncontrolled outputs and supports safe system behavior under fault conditions, making it a critical component in safety-related control architectures.

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