I/O System Watchdog Timer - WDT5

Description

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.