Temperature Monitoring/Display; Watchdog (Wd) - Siemens SIMATIC IPC277D Operating Instructions Manual

Advanced device functions
5.1 Monitoring functions
5.1.2

Temperature monitoring/display

Temperature monitoring
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
The DiagBase or DiagMonitor software is enabled
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)

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
alarm remains after the restart.
Watchdog reactions
The following reactions may be triggered if the watchdog is not retriggered within the set
time:
Reaction
Trigger a PC reset
Output DiagBase alarm messages
Note
Contact Customer Support for a detailed description of the Watchdog functions.
58
Option
None
Option
Configurable
None
Operating Instructions, 12/2016, A5E03409486-AE
SIMATIC IPC277D