停滞时间信号，请参阅。
Summary
1) Detect a rising edge on a discrete input
2) Twenty seconds after that detection, make an output go high for one second.
Caveats
- The twenty-second delay will be an HMI setpoint; here it is controlled by two inputs, decreasing or increasing 5s at a time
- (In-;)Accuracy
- Probably +/- one, or a few, scan times
- Plus any non-deterministic effects of using a TON timer
