Temperature Monitoring/Display; Watchdog (Wd) - Siemens SIMATIC HMI IPC577C Operating Instructions Manual

Functions

10.2 Temperature monitoring/display

10.2 Temperature monitoring/display
Temperature monitoring
The temperature is recorded by two temperature sensors. One sensor monitors the
processor temperature and the other monitors the temperature near the RAM module.
When the temperature exceeds one of the two defined temperature thresholds, the following
error reactions are triggered:
Reaction
The DiagBase or DiagMonitor software is enabled
The temperature error is retained until the temperatures have fallen below the thresholds
and are reset by one of the following measures:
● Acknowledgement of error messages
● Restart of the device
10.3

Watchdog (WD)

Function
If the user program does not respond to the watchdog within the predetermined monitoring
time, the watchdog monitors the program process and informs the user about various
reactions.
The watchdog is idle when the PC is switched on or after a HW RESET(cold restart), which
means no reaction of the WD is triggered.
Watchdog reactions
If the WD is not triggered again within the set time (by application with the help of the
DiagBase driver), the following reactions will be triggered:
Reaction
Trigger a PC reset
DiagBase or DiagMonitor software is enabled
Note
If the desired device reset does not occur, set Bit 7 to the value 0 in the General Purpose
Ports (GPP) output register (address 404D) .
82
Option
None
Option
Configurable
None
Operating Instructions, 10/2010, A5E02368074-02
SIMATIC HMI IPC577C