Enabling the indicator to be ON immediately when switch pressed and OFF after a 5 sec delay by the switch.
PLC Ladder Programming Training Examples
Topics Covered in this example is PLC Timer (OFF Delay).
Number of PLC Inputs Required
X1 – Start Switch.
Number of PLC Outputs Required
Y1 – Output Indicator
Number of PLC Timer Required
T0 – 5 second Timer, 100 ms Time Base. (See K50 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.
