FB_C69xxSetWatchdog
 | This function block is deprecated on newer IPCs. Use FB_PcWatchdog_BAPI from Tc2_System instead. |
The function block FB_C69xxSetWatchdog enables a hardware watchdog on the C69xx PC. The watchdog is enabled via bEnable = TRUE and the tTimeOut time. The tTimeOut time can be a minimum of 2 seconds and a maximum of 255 seconds.
Once the watchdog has been enabled, the function block instance must be called cyclically at shorter intervals than tTimeOut, since the C69xx PC restarts automatically when tTimeOut has elapsed. The watchdog can therefore be used to automatically reboot systems, which have entered an infinite loop or where the PLC has become stuck.
The watchdog can be disabled via bEnable = FALSE or tTimeOut = T#0s.
Notice | |
Reboot The watchdog must be disabled before breakpoints are used, before a PLC reset or an overall reset, before a TwinCAT stop, before switching to Config mode or before the configuration is activated, because otherwise the C69xx would reboot immediately once tTimeOut has elapsed. |
Inputs
VAR_INPUT
tTimeOut : TIME;
bEnable : BOOL;
END_VAR
Name | Type | Description |
|---|---|---|
tTimeOut | TIME | Watchdog time, after which a restart is performed. |
bEnable | BOOL | Enabling/disabling the watchdog. |
Outputs
VAR_OUTPUT
bEnabled : BOOL;
bError : BOOL;
END_VAR
Name | Type | Description |
|---|---|---|
bEnabled | BOOL | TRUE = Watchdog is enabled, FALSE = Watchdog is disabled. |
bError | BOOL | Error when enabling or disabling the watchdog. |
Requirements
|
Development environment |
Target plattform |
PLC Libraries to include |
|---|---|---|
|
TwinCAT v3.0.0 |
PC (i386) |
Tc2_SystemC69xx |