Functions
9.3 Watchdog (WD)
SIMATIC IPC647C
Operating Instructions, 12/2010, A5E02669337-02
61
9.3
Watchdog (WD)
Function
The watchdog (WD) monitors the activities of the device and reports a crash to the user by
means of various reactions.
After POWER ON of the device or after a HW RESET (cold restart), the watchdog is in idle
state, i.e. a reaction of the WD will not be triggered and the Watchdog LED is switched off.
The Watchdog LED is lit green when the watchdog is enabled (by means of the monitoring
software, e.g. DiagBase or DiagMonitor software.)
WD reactions
If the watchdog is not triggered again within the set time (through monitoring software), the
following reactions are triggered:
Reaction
Option
Watchdog LED changeover from green to red
None
Trigger a PC reset
Configurable
SIMATIC monitoring software is activated
None
WD monitoring times (TWD)
The monitoring times can be set in increments of one second within a range from 3 to 255
seconds.
Note
The watchdog is retriggered if the monitoring time is changed at the active watchdog (that is
while the watchdog is running)!
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