Question

Design a ladder diagram to shut off 3 motors with 10 sec intervals use TOF

Answer 1

Here is a ladder diagram to turn off 3 motors with 10-second intervals using the TOF (Timer Off Delay) function in PLC programming:

```
|-----[ ]------------------+--( )-----------------|
| | TOF (10 sec) |
| | |
|-----[Motor 1]---[ ]------+----/\/\---------------|
| |
|-----[ ]------------------+--( )-----------------|
| | TOF (10 sec) |
| | |
|-----[Motor 2]---[ ]------+----/\/\---------------|
| |
|-----[ ]------------------+--( )-----------------|
| | TOF (10 sec) |
| | |
|-----[Motor 3]---[ ]------+----/\/\---------------|
```

In this diagram, each motor is controlled by a separate TOF timer that is set to 10 seconds. When the ladder logic is energized, each timer will begin counting down from 10 seconds. Once the timer reaches 0, it will turn off the corresponding motor. This process will repeat every 10 seconds, effectively shutting off each motor at 10-second intervals.