Function description
APCIe-040
4
Function description
4.1
One or two-level alarm system
With watchdogs 1-6, a one-level alarm system can be implemented and with watchdog 0, a two-level
alarm system.
Via watchdog 0, the first alarm level can be released. This means that a warning relay is switched
(closing contact) and/or an interrupt is released after the watchdog has run down.
In the interrupt routine, a user application may analyse the reason why the watchdog has run down.
If the reason should not be found during a programmable delay, the second alarm level can be
released by switching the reset relay.
In addition, the internal computer temperature can be monitored over the onboard temperature
sensor (see Chapter 4.7).
Fig. 4-1: Operation of the one or two-level alarm system
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