At a Glance

  • "Loss of Control” Detection
  • 24V PLC Sourcing Logic Compatible
  • Fail-Safe - Output relay de-energizes for all fault conditions
  • +/- 2% Timing Accuracy
  • Compact Encapsulated Design
  • -40°C to +85°C Operation
  • 3 Year Limited Factory Warranty
  • FORM C Output (8 Amp)
  • Fits 8-Pin Octal Socket
  • Power and Output LEDs


  • User-specified or Adjustable Time-outs
  • Opto-isolated Input
  • Input Indicator
  • 24V Power Supply Monitoring / Supervision
  • Dual Edge Trigger
  • Power up Trigger
  • Re-trigger Lockout on Fault
  • Customize It! IPD is glad to quote your specific custom module



P8E-WDT24/PLC Watchdog Timers enhance the popular Brentek P8-Series of PLC watchdog timers with advanced features such as a precision timer design (+/-2% accuracy), higher rated output contacts (8 Amps) and many new configurable options.

P8E-Series Watchdog Timers are designed to monitor control system integrity as a “System Watchdog” in PLC (Programmable Logic Controller), SBC (Single-board Controller) and other OEM control applications. Control system integrity is monitored by an edge-triggered Watchdog input. While the internal timer is reset by controller activity, the FORM C Dry Output Contact is maintained (energized). Upon time-out or loss of power, the output relay de-energizes, indicating “loss of control” which can by configured to ALARM, SHUTDOWN or RESET the system.

Loss of Control is caused by problems such as CPU latch-up, control system faults, wiring/cabling failure, unauthorized tampering, 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 Low Profile packaging is a direct plug-in to an industry standard 8-pin octal socket, such as Brentek p/n DIN8 Octal Relay Socket which can be either DIN rail or panel mounted.

P8E-WDT24/PLC types are available with an adjustable timeout range (see options for ranges) or a specified fixed timeout from 50 milliseconds to 60 seconds. Input options include optical-isolation and Input indicator.  The base model# is P8E-WDT24/PLC (24VDC operation, 2-second fixed timeout, FORM C (8 Amp rated) Dry Contact output, and a PLC compatible WDI input for direct connect to 24V sourcing logic. 

How to Purchase Customize It!