Siemens SIMATIC IPC427C Operations Instructions Page 56

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Functions
9.1 Monitoring Functions
SIMATIC IPC427C
56 Operating Instructions, 10/2010, A5E02414743-03
If one of the three configured temperature values is exceeded (CPU: 100°C, RAM: 90°C,
motherboard: 90°C), the following fault reaction is triggered:
Reaction Option
The DiagBase or DiagMonitor software is enabled None
The temperature error is retained in memory until temperatures have fallen below the
thresholds and it is reset by one of the following measures:
Acknowledgment of the error message by the monitoring software
Restart of the device
9.1.3 Watchdog (WD)
Function
If the user program does not respond to the watchdog within the predetermined monitoring
time, the watchdog monitors the program process and informs the user about 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.
Watchdog reactions
If the watchdog is not triggered again within the set time, the following reactions will be
triggered:
Reaction Option
Switch watchdog LED to red None
Trigger a PC reset Configurable
DiagBase or DiagMonitor software is enabled None
Note
If the desired device reset is not performed, go the Advanced menu of the BIOS Setup and
set the SafeCard functions to Enabled. Contact Customer Support for a detailed description
of the Watchdog functions.
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