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Light ON OFF Control using PLC

We most often come across light ON OFF control; single switch with multiple conditions using programmable logic control (PLC) is discussed here.

PLC Light ON OFF Control

Light ON OFF Control using PLC

Note : The above image used only as reference, terminal details may be different with the logic.

Lamp Control Logic

There are only two switch for start and stop lamp. The conditions are,

PLC Light Control Logic Conditions

Note: If stop switch is pressed at any one of the above step, the process should stop.

Inputs and Outputs

PLC Inputs and Outputs for Light Control

PLC Ladder Logic for Light Control

PLC Light Control

PLC Lamp Ladder Logic example


PLC Logic for Light System

PLC Logic Decription

 RUNG 0000

Latching rung to operate the system through Master Start and Stop switch..Lamp should be turned on when start is pressed.

RUNG 0001 to RUNG 0006

when start is turned on/off memories are latched to store the status of Start switch

RUNG 0007

Conditions are wired in series and parallel to make the condition possible.


The above explained Light turn ON/OFF control using PLC is for example only. It may vary from real time. We can use this example program to understand the working of memories and Latching in AB PLC.

Author : Hema Sundaresan

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Light ON OFF Control using PLC

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