Enabling the indicator to be ON after a 3 sec delay when switch pressed and OFF immediately by the switch
PLC Ladder Programming Training Examples
Topics Covered in this example is PLC Timer (ON Delay).
Number of PLC Inputs Required
X1 – Start Switch.
Number of PLC Outputs Required
Y1 – Output Indicator
Number of PLC Timer Required
T0 – 3 second Timer, 100 ms Time Base. (See K30 Preset Value for Timer)
PLC Ladder Programming:
PLC Ladder Program Description:
·When X1 = ON, TMR instruction will be executed. Timer T1 will be ON and start counting for 3 sec. When T1 reaches its set value, the NO (Normally Open)
contact T1 will be activated and indicator YI will be ON.
·When X1 = OFF, TMR instruction will not be executed. Timer T1 will be OFF and so will NO contact T1. Therefore, the indicator Y1 will be OFF.
