One Shot Rising PLC Example Program

Build the ladder logic program to turn ON or OFF the lamp using single push buttons using one shot rising (ONR) instruction.

PLC Push button Instruction

ONE Shot Rising (OSR) Instruction

One shot Rising is used to develop a signal/Pulse that is exactly one scan in duration. When a signal is applied to a contact/Push Button, no matter how long the signal stays on, a single pulse of one scan length is generated after the one shot.

List of Inputs and Outputs

One Shot PLC Inputs and Outputs

PLC Logic Conditions

One Shot PLC Logic Conditions

One Shot Rising PLC Program

One Shot Rising PLC Example Program

Program Description

RUNG 0000

Start/Stop Push Button is connected with one shot rising bit with the output memory bit.

RUNG 0001

Previous rung output bit and Lamp output bit are connected in X-OR gate logic to make the condition possible. Interlocking of output bit is used to turn the output ON/OFF in different condition.


The above explained ladder logic for lamp turn ON/OFF using single push button is for example only. We can use this example program to understand the working of Push Buttons, one shot rising in AB PLC.

Author : Hema Sundaresan

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