Hi 

Siemens s7-1200

I have an motion sensor. 

When motion Motor should run for 3 minutes. 

But if new motion i want the motor to run 3 minutes from the last motion. 

Is there anu function that can do that? 

click to enlarge

Use "SENSOR" in the place of "START_BUTTON"
if the sensor should trigger the motor to switch on.

Hi 

thanks for the help. 

What should i write where you write #done? 

Andersskjeggerud

Hi 

thanks for the help. 

What should i write where you write #done? 

It can be an M-bit like %M20.0.
Or it could be a parameter defined in the TEMP area of the code block.

Hi 

With that code 

the motor dont stop after 3 minutes. 

when sensor goes off the timer stop counting and the motor wont stop after 3 minutes. 

Andersskjeggerud

Hi

With that code

the motor dont stop after 3 minutes.

when sensor goes off the timer stop counting and the motor wont stop after 3 minutes.

Hello.

The code does what I expect it to, to solve the problem as I understood it. You can find 2 animations attached as a ZIP that demonstrates the working. What of the behaviour is not correct?

a) What is the polarity of the sensor?
b) Are you using the timer only once?

Mr. Jacek was suggesting a simpler solution. It will do the job, but can become messy expanding with more functionality. (Change T#2s to T#3M for your case.)


<click me>

** Animation recorded of a simulated session of Step7 V15.1

Hi 

thanks! its working now. 

[snip]