Functions
10.2 Temperature monitoring
SIMATIC HMI IPC677C
108 Operating Instructions, 04/2013, A5E02722710-04
10.2 Temperature monitoring
Temperature monitoring
The temperature is monitored at several locations of the device. Amongst others, one
thermocouple monitors the processor temperature, another the temperature in the area near
the power supply, and a third the air intake temperature next to the DVI port.
The following fault reactions are triggered if one of the temperature values exceeds the set
temperature threshold:
Response Option
Device and CPU fans are set to maximum speed. None
The DiagBase or DiagMonitor software is enabled None
Temperature errors do not occur under normal operation. If a temperature does occur, check
for the following possible causes:
● Are the fan apertures covered?
● Is the fan functioning correctly?
● Is the ambient temperature within the specified range?
● Is the total output of the power supply within the specified limit?
The temperature error is retained in memory until temperatures have fallen below the
thresholds and are reset by one of the following measures:
● Acknowledgment of the error message by the monitoring software
● Restart of the device
10.3 Watchdog (WD)
Function
The watchdog monitors IPC execution and reports a crash of the IPC to the user by means
of various reactions.
The watchdog is idle when the PC is switched on or after a HW-RESET(cold restart), i.e., no
reaction of the WD is triggered.
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