The Watchdog is armed by software command and both counters begin counting down. A number greater than zero is set into the chip’s Counters 0 and 1 by your application program. This chip contains three 16-bit counters. The method used by the WDG-CSM card to detect loss of computer function is as follows: The more frequently the Watchdog is prompted (and shorter Watchdog time selected), the less time a faulty computer has to cause damage. If, however, the failure is persistent, the Watchdog will continuously reset the computer. If the failure was temporary, proper operation is resumed. If the reboot is successful, operation, may be returned to the previous application program. If this communication (“prompt”) is missed, the Watchdog can be programmed to initiate a computer reset (reboot).
Your application program must communicate with the watchdog circuit at prescribed intervals. On the other hand, ACCES’ Watchdog card offers excellent protection from temporary malfunctions at very low cost. Redundancy, a duplication of computer circuitry, is very expensive. Neither method offers 100% assurance, but both of these methods reduce risk or consequences of failure. There are two methods to reduce risk of computer or software failure (a) redundancy and (b) a watchdog circuit. Even if a program merely locks up, an unattended computer could be down for days. If a computer or program fails it can cause catastrophic damage. It’s a fact of life that computers and programs can fail. When a fault occurs, the card automatically generates outputs that can be used either to initiate corrective action or to generate alarms.
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PCI-WDG-CSM continuously monitors critical PC functions. These are: a computer power supply monitor, a computer internal temperature monitor, an optional capability to read the temperature, a fan-speed monitor, and an on-card buzzer to signal watchdog timeout.
Additionally, one or more options may be included on your card. This multifunction card contains a watchdog timer.
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