Technical data

Hardware Information
6-12
SIMATIC Panel PC 670 Computing Unit Equipment Manual
Edition 12/01
6.6.3 Temperature Monitoring and Display
Temperature monitoring
The temperature is acquired by three thermocouples. One thermocouple monitors
the processor temperature, the second monitors the temperature in the processor
module area and the expansion boards, while the third monitors the temperature in
the power supply module area. The following conditions result in a temperature
drift:
S temperature exceeds the threshold value for overheating
S temperature falls below the threshold value for underheating
The temperature thresholds can be set separately (by driver or SOM program).
One of the following reactions is triggered should the temperature drift:
Reaction Options
Temp LED from OFF to YELLOW Always
Trigger IRQ Adjustable
6.6.4 Watchdog (WD)
Function
The watchdog monitors the execution of a program. The purpose of the WD is to
report a program crashing to the user by means of different reactions.
The watchdog is idle when you turn on the computing unit or following a HW
RESET(cold restart) – in other words, no reaction by the WD is initiated.