Siemens call SFB4 in a FB

S7PP · Aug 29, 2011

Hi Guys,

Please help on this: I called an SFB4 (TON)in a FB,

Do you know how to calculate how much time left?

On the picture, I want the value which is PT-ET=?

How to achieve that?

Thanks!!

L D[AR2P#0.0] · Aug 29, 2011

Calculate remaining time as follows:

S7PP · Aug 29, 2011

Thanks, I just found out that I may use a slow way to do it, like this.

I forgot STL. My boss said that the customer didn't want STL so he let me forget it. I really did.

Thanks a lot. sometimes I just go nuts.

TurpoUrpo · Aug 30, 2011

If you do it in ladder, use temps rather than m area.

Jeebs · Aug 30, 2011

There are 3 'MOVE's too many in your code.
Makes it hard to follow.
Just use the SUB_DI with the temp variables.
Just like L D showed you. (what he wrote can easily be done in a single LAD statement)

L D[AR2P#0.0] · Aug 30, 2011

If you turn off type checking you can enter it as follows. Not recommended though.

S7PP · Aug 30, 2011

I see. Thank you very much!

Siemens call SFB4 in a FB

S7PP

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L D[AR2P#0.0]

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S7PP

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TurpoUrpo

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Jeebs

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L D[AR2P#0.0]

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S7PP

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