Motor ON/OFF application using pulse timer and pulse timer instruction of the PLC.

Motor ON/OFF application using pulse timer and pulse timer instruction of the PLC.

Problem Description

Motor ON/OFF application using pulse timer and pulse timer instruction the PLC.

Problem Diagram

Pulse timer can be used when input signal is pulse time. We can use pulse timer to set motor for a programmed duration.

The instruction is started when result of the input changes from 0 state to 1 (or positive edge). 

In this timer if a new positive edge trigger, the signal state at the output is not affected as long as the programmed time is running.

In case of, PLC we can use pulse timer instruction. In this take NO contact of the switch and pulse timer between NO contact and the output coil.

For practical give positive edge to the timer, timer will start and after that other positive edge will not affect the timer.

Motor ON/OFF application using retentive timer and retentive timer instruction of the PLC.

Motor ON/OFF application using retentive timer and retentive timer instruction of the PLC.

Problem Description

Motor ON/OFF application using retentive timer and retentive timer instruction of the PLC.

Problem Diagram

The retentive timer is used to store the time in the application.This timer will be ON when input status changes from 0 to 1.

Here we used retentive timer for the application because we want to store the time or hold the timer.

Even if input signal state changes from 1 to 0 , time will not become zero but timer will accumulate the time.

And when delay is completed , motor will be ON.

In case of PLC take NO contact of the switch and provide retentive timer before output coil (here motor).

When we start switch retentive timer will be start and switch is OFF, it will accumulate the time.

And after delay motor will be ON.