Commissioning the device and device functions
4.3 Advanced device functions
SIMATIC IPC277E
Operating Instructions, 11/2019, A5E35783335-AE
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4.3.1.3
Watchdog (WD)
Configuration
You configure the watchdog with the DiagBase or DiagMonitor software.
Function
The watchdog is able to monitor system runtime and informs the user about the different
reactions that are triggered if the system does not respond to the watchdog within the
specified monitoring time.
A watchdog alarm is retained after a restart and is reset and logged by the DiagBase or
DiagMonitor software. The watchdog configuration is retained in the process.
Watchdog reactions
The following reactions can occur if the watchdog is not addressed within the set time:
Option
Reaction
Reset on
Executes a hardware reset when the watchdog expires
Reset off
Executes no action when the watchdog expires
Restart
Restarts the operating system when the watchdog expires
Shutdown
Shuts down the operating system when the watchdog expires
NOTICE
"Reset on" option
The "Reset on" option immediately triggers a hardware reset that may result in loss of data
under Windows and damage to the installation.
Watchdog monitoring times
The hardware supports the following times:
●
Normal mode: 94 ms, 210 ms, 340 ms, 460 ms, 590 ms, 710 ms, 840 ms and 960 ms.
●
Macro mode: 2s, 4s, 6s, 8s, 16s, 32s, 48s and 64s.
Set the monitoring times in SIMATIC Diagnostics Management as integer in the range from 4
to 64 seconds.
Note
Contact Customer Support for a detailed description of the Watchdog functions.
