Temperature Monitoring/Display; Watchdog (Wd) With Led - Siemens SIMATIC IPC647D Operating Instructions Manual

Extended device functions
5.1 Monitoring functions
5.1.2

Temperature monitoring/display

Three temperature sensors monitor the temperature of the device at several positions:
● Processor temperature
● Temperature close to the RAM ICs/chips
● Temperature of the basic module
A temperature error is triggered when one of the three temperature values exceeds the set
temperature threshold and the following reaction is initiated:
Reaction
"Temp" LED lit red.
Device fan at maximum speed. The power supply unit fan is controlled by the
power supply unit.
The DiagBase or DiagMonitor software alerts the user.
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
5.1.3

Watchdog (WD) with LED

Function
The watchdog is able to monitor program runtime and informs the user about the different
reactions that are triggered if the user program does not respond to the watchdog within the
specified monitoring time.
The watchdog is in idle state during power on of the device, or after a HW-RESET (cold
restart). A WD reaction is not triggered while it is in idle state. However, an active watchdog
interrupt remains after a restart and its active state is still indicated by the LED.
Watchdog reactions
The following reactions may be triggered if the watchdog is not retriggered within the set
time:
Reaction
Switch watchdog LED to red
Trigger a PC reset
Output of DiagBase alarm messages
Note
For more information on the watchdog functions, contact Customer Support.
54
Option
None
Configurable
None
Operating Instructions, 01/2014, A5E32996306-AA
Option
None
None
None
SIMATIC IPC647D