Problem
In a controlled pneumatic system, a timer is activated by X1 and X2 which represent two sensors (inputs X1 and X2) if input X3 is off.
The Timer is set to 5 seconds and switches light 1 and light 2 on.
Light 2 can be also switched on/off by input X4.
The Timer resets itself. Note: Inputs X1, X2, X4 are NO. considering that input X3 is NC.
How would you design a logic ladder diagram using the available information?