The real-time clock can be configured to read and write in BCD code or decimal format;

When real-time clock error detection is enabled, if the real-time clock is abnormal, the PLC will enter the ERROR or STOP state, and the PLC will stop running. You can check whether D8176 is equal to 9 or monitor the status bar information through the upper software;

When real-time clock error detection is not enabled, even if the real-time clock is abnormal, it will not affect the normal operation of the PLC. It is still possible to check whether the PLC is abnormal through D8176 or the monitoring information status bar;

Users can choose whether to configure a watchdog timer and set the watchdog timer value. This function is generally used to detect the problem of dead loops caused by users writing ladder diagrams or function blocks;

At the end of each scanning cycle of PLC operation, the watchdog will be reset internally by default, or it can be manually reset by using the WDT instruction in the ladder program;

If there is no reset after exceeding the set value time, the PLC will enter the ERROR or STOP state, and the PLC will stop running. You can check whether D8176 is equal to 10 or monitor the status bar information through the upper software;

This parameter is used to set the PLC to determine the filtering time of the PLC power-off software. If it is set to the default value of 50ms, it indicates that the power grid fluctuation is below 50ms, and the PLC is considered to be in a normal power supply state. If it exceeds 50ms, the PLC is considered to have entered a power-off state, and the PLC will stop running and store power-off maintenance data;

When external interference is severe and causes the PLC to enter the STOP power-off state during operation, the power-off detection time can be appropriately increased.

When increasing this value, it may affect the normal storage of power-off data, causing the power-off data to not be maintained. Therefore, the power-off detection time should only be slightly increased appropriately when the external power supply voltage is unstable and the PLC may mistakenly enter the power-off mode. In other cases, please do not modify this parameter value without authorization;