Temperature Monitoring/Display; Watchdog (Wd) - Siemens SIMATIC Rack PC 547B Operating Instructions Manual

Functions

9.2 Temperature monitoring/display

9.2 Temperature monitoring/display
Temperature monitoring
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 filter dirty?
● 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 problem is indicated by the status LED on the front panel and by the monitoring software
if it is installed.
The temperature error is retained until the temperatures have fallen below the thresholds
and are reset by one of the following measures:
● The error alarm is acknowledged by pressing the Info button on the SystemGuard user
interface.
● Restart of the device
9.3

Watchdog (WD)

Function
The watchdog monitors program execution and reports a program crash to the user by
means of various reactions.
The watchdog can only be activated by monitoring software. The watchdog is idle when the
PC is switched on or after a hardware reset (cold restart), in other words, no watchdog
reaction is triggered. If the watchdog is activated and was not retriggered by the monitoring
software within the selected time, the monitoring software is activated.
You can find additional information on the supplied "Documentation and Drivers" CD in the
utilities\sysguard directory.
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SIMATIC Rack PC 547B
Operating Instructions, 12/2007, A5E01127519-02