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
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):
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.
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