The following PLC connection diagram explains the drilling operation with delay. Modify the circuit, so that you need to only press ONCE both PB1 and PB2 in the beginning to start the program. The cylinder will return back when the limit switch is activated. 24V PB1 PB2 Input X1 -x2 x3 X4 Program X1 HHE G HH C1 HH T1 HHO Y1 Output Y10 120 Y30 Motor Sol N OV