Omron SYSMAC C Series User Manual page 54

Application examples
Automatic car washing
machine
Ladder diagram
>
~L
0000 1001
1000
The C20 is used to control a car washing machine in this example.
Explanation
As input devices, a vehicle-detecting device and pushbutton switches
are used. In response to the signals from these devices, the C20 opens a
valve for the spray and starts the motor for the revolving brush.
1/0 assignment
Start button
Vehicle detector
Condition at which washing machine stops
Output
Spray valve
Brush motor
Movement of washing machine