Home » Pulse Generation using Timer in Siemens PLC
PLC Tutorials

Pulse Generation using Timer in Siemens PLC

This article is about a pulse generation PLC program using Siemens TIA PORTAL.

In industries, we use special audio and visual indications to notify the operators about the alarms and trips of the process. Different types of indications are flashing LED, beacons with different tones, etc.

We can set the rate of pulses from slow to fast as per our requirement by changing the timing of the timers. Here we will be discussing the pulse generation using timer instruction in Siemens PLC.

Below I have explained the PLC program for pulse generation.

Inputs and Outputs

  • Inputs: START(I0.0), STOP (I0.1)
  • Outputs: LED_INDICATION (Q0.0)
  • Timers: T0 & T1
  • Memory Bit: M0.0

Pulse Generation using TimerPulse Generation using Timer in Siemens PLC

Description

When you press the start button (%I0.0), then the flip-flop (M0.0) energizes then it will pass the signal through NC contact of timer (T2) then timer 1 will energize.

Here I have used S_Pulse timer which will run in our case for 2 seconds after 2 seconds timer will energize.

We can change the timing of the timer to change the flashing rate as per our requirement.

If Timer 1 is not energized then first NOT instruction will energize the Timer 2 allowing output to turn ON for 2 seconds.

Both the timers will run for 2 seconds simultaneously allowing LED to turn ON and OFF for every 2 seconds thus flashing the LED.

Author: Suhel Patel

Read Next:

Share With Your Friends

Related Articles

ON and OFF a Group of Outputs by One Push button PLC Logic

S Bharadwaj Reddy

Scale and Normalize Instructions in PLC

S Bharadwaj Reddy

Allen Bradley PLC Subroutines

S Bharadwaj Reddy

Electrical Switches Principle & Types

S Bharadwaj Reddy

PLC Analog Input Card Resolution Effects on Accuracy

S Bharadwaj Reddy

Motor Stop Interlock for Changing the Direction PLC Program

S Bharadwaj Reddy

2 comments

Kumar April 5, 2020 at 11:48 am

Hi,

What is the need of two timers?

Reply
Suhel April 5, 2020 at 1:03 pm

To generate the pulses, 1 timer stay ON for 2 sec, so another timer will remain OFF for 2 sec. thus generating pulse for that interval

Reply

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Pulse Generation using Timer in Siemens PLC

WordPress Image Lightbox
Send this to a friend