When most individuals consider {hardware} OS Watchdog timers, they consider a tool used to mechanically reboot a locked up laptop. Nevertheless these gadgets can be utilized for a lot of different purposes requiring a count-down timer and typical watchdog capabilities. This text discusses a few various software concepts.
1. Audible Alarm or Safety Panel Connection
There are some purposes the place a pc could have a number of crucial packages executing and it can’t be reset simply because a single program fails. On this scenario you would have this system that usually fails be the one “speaking” to the watchdog. That method if this system fails, it’s going to cease speaking to the watchdog board and it’ll timeout and enter its restart mode digital kitchen timer B09NZH2QBD.
Most laptop watchdog timers are outfitted with further auxiliary relays which have dry contact kind closures that may be set to both pulse or latch on when a timeout happens. You can use this relay to activate an audible alarm or you would join the contacts to a zone enter on a safety panel. As soon as triggered the safety panel would name a central monitoring station in order that they might summon a technician.
2. Exterior Set off Sign Timing
Some watchdog timers are outfitted with an exterior digital kind enter that may be toggled with an exterior sign or a dry contact kind swap closure. Sometimes this enter is used to “tickle” the watchdog so that’s doesn’t rely down and reset the pc. In some purposes chances are you’ll simply wish to monitor an exterior set off sign to see if it stops or if there are giant timing gaps.
The watchdog timer ought to have a programmable methodology to let you load an preliminary countdown timer worth and a technique to get a rely of the variety of exterior sign toggles. With that data you would wait some period of time, then learn the present count-down time from the watchdog and the exterior set off rely to see if the variety of toggles per second are inside tolerance. If the exterior enter sign had been to fully fail, the watchdog would day out and increment a reset counter you can learn with a person program, or use the auxiliary relay as described within the first part.
Hopefully this text has proven you that there are different precious capabilities {that a} {hardware} OS Watchdog timer can present different than simply rebooting (resetting) a locked up or malfunctioning laptop. There are a lot of extra distinctive purposes that may very well be explored.