At a Glance

  • System Fail-Safe
  • "Loss of Control" Detector
  • Dry Contact Relay Output
  • Classic 0.6", G1 and 70  I/O Rack Compatiblity
  • 5, 12, 15, or 24 Volt Logic
  • 3-Year Limited Warranty
  • 2 Second Timeout
  • Negative Edge-triggered
  • 1 Amp 20VA Fail-OPEN Output
  • User-specified Timeouts
  • Adjustable Timeouts
  • 0.5A 10VA Fail-CLOSED Output
  • 5 Amp Output
  • Customize It! IPD is glad to quote your specific custom module


Brentek’s WDT5 Watchdog Timer Modules monitor an I/O control system’s activity by detecting on/off transitions of a control line. During normal system operation, the watchdog’s internal timer is continually reset by control line activity and its dry-contact output remains energized. When control is lost (control line stops toggling), the timer times-out and de-energizes the output contact, indicating “Loss of Control”. 

Loss of Control is caused by problems such as CPU latch-up, control system faults, wiring/cabling failure, unanticipated software conditions, communications problems, or power failures. The system designer can use the watchdog timer's output contact to address Loss-of-Control by energizing an alarm, shutting down the system, or providing a reset signal to the CPU/controller.

The WDT5 Watchdog Timer Modules use patented timing technology to monitor control system integrity.  It comes standard with a two-second timeout and works with 4 logic voltages (5V, 112, 15, and 24 VDC):

  • WDT5
  • WDT12
  • WDT15
  • WDT24

The output is a dry contact relay which is rated at 1 Amp resistive (20VA) and is configured to Fail-OPEN.  The WDT5 has a compact footprint and provides direct plug-in compatibility with Industry-standard “Classic” 0.6” I/O racks from Brentek, OPTO 22 (G1), and Grayhill (70). 

Both customer-specified timeouts and adjustable timeouts are available.  These watchdog timers come standard with a dry contact output which is rated at 1 Amp resistive (20VA) and is configured to Fail-OPEN.  Optionally, they have a Fail-CLOSED relay that is rated at 0.5 Amps resistive (10 VA) or a 5 Amp Fail-OPEN output relay. 

    The WDT5 is available from IPD, Inc. on Amazon. The Brentek WDT5 Watchdog Timer is available from IPD, Inc. on


How to Purchase Customize It!