1.使用前必须了解该功能块的功能、用法：
With SFC 32 "SRT_DINT" (start time-delay interrupt), you start a time-delay interrupt that calls a time-delay interrupt organization block once the delay time has elapsed (parameter DTIME).
With the SIGN parameter, you can enter an identifier that identifies the start of the time-delay interrupt. The values of DTIME and SIGN appear again in the start event information of the specified OB when it is executed.
2.该能块涉及OB20-OB23。
3.详见在STEP7中的帮助中有关SFC的介绍。