s7-1200 basic HMI time remaining

shane_bac

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May 2014

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• Nov 27, 2014

• #1

I am currently using a HMI to set the time in a TP block and using the ET to show the value of the time elapsed on the HMI. How do I configure this value to show the time remaining? Any thoughts would be appreciated, thank you.

 

rQx

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• Nov 27, 2014

• #2

Sub: Pv-ev?

 

shane_bac

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• Nov 27, 2014

• #3

Will I need to store the value from PT and ET rather than just declaring the tags from the HMI to do the calculation as I cannot access PT and ET values in the calculation block inputs

 

balash

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• Nov 27, 2014

• #4

shane_bac said:

Will I need to store the value from PT and ET rather than just declaring the tags from the HMI to do the calculation as I cannot access PT and ET values in the calculation block inputs

Click to expand...

that would be odd.
how come you cannot access?
do you mean calculation block as code block in LAD?
but then why would you use calculation block from simple SUB operation...

 

adfox

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Jun 2006

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Poland

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• Nov 28, 2014

• #5

Look at my example - Take timer data and pass it to function...
http://imgur.com/Qpvq4D0,09JrxwA#1

And inside function:

http://imgur.com/Qpvq4D0,09JrxwA#0