F_CP66xxSetWatchdog

The function F_CP66xxSetWatchdog activates a hardware watchdog on the CP66xx-xxxx-0000. The watchdog is enabled with bEnable = TRUE and a timeout time. The minimum timeout time is a few times the cycle time in which the function F_CP66xxSetWatchdog is called, the maximum timeout time is 64sec and 431 millisec.

Once the watchdog is activated, the function has to be called cyclically, because if the tTimeOut-time expires then the CP66xx-xxxx-0000 automatically reboots. The watchdog can be used to reboot the system if the PLC gets stuck (i.e. in an endless loop).

The watchdog can be disabled by bEnable = FALSE.

The Watchdog has to be disabled before using breakpoints, before a PLC reset or PLC reset all, before a TwinCAT Stop, a change to Config Mode or before activating the configuration, otherwise the CP66xx-xxxx-0000 reboots immediately after the timeout time has expired!

FUNCTION F_CP66xxSetWatchdog : BOOL

VAR_INPUT
    tTimeout        : TIME;
    bEnable         : BOOL;
END_VAR