Siemens S7, DT

tomhelliwell · Jun 24, 2011

Hi All,
I have a problem with Siemens S7, I have created a FC that generates a DT. The problem is I can't seem to fugure out how to return the DT.

I have attached a Screenshot to show what I mean.

Thanks

Tom

L D[AR2P#0.0] · Jun 24, 2011

Indirect addressing required. Add the following code to the end of your block, and add "outdb" as an INT to your temp area.

Code:

      L     P##DTOUT
      LAR2  
      L     W [AR2,P#0.0]
      T     #outdb
      L     D [AR2,P#2.0]
      LAR2  
      OPN   DB [#outdb]
      LAR1  P##DT_1
      L     D [AR1,P#0.0]
      L     D [AR1,P#4.0]
      T     D [AR2,P#4.0]
      TAK   
      T     D [AR2,P#0.0]

JesperMP · Jun 24, 2011

I think that "DT" is just a shorter way to write DATE_AND_TIME.
Create a variable in a global DB with type DATE_AND_TIME.
Your BLKMOV can then point to the variable. Just type the symbolic name, i.e. "MyDB".My_DT_var

jogibear9988 · Jun 24, 2011

@L D[AR2,P#0.0]

You also need to check that outdb is not zero, and when it is, not open the db! And that when di is accesed you need to use opn di or replace the di address marker with the one for a db!

L D[AR2P#0.0] · Jun 24, 2011

If outdb is zero, then

Code:

      OPN   DB [#outdb]

is executed as NOP.

L D[AR2P#0.0] · Jun 24, 2011

jogibear9988 said:
And that when di is accesed you need to use opn di or replace the di address marker with the one for a db!

No. A DT data type parameter is passed to an FC as a DB pointer. Even if the calling block is an FB and the DT is in the STAT area, the db pointer passed will contain a global DB number and the absolute address of the STAT variable.

jogibear9988 · Jun 24, 2011

Ok

Thanks for the Infos. If not tryed it, but i thought open db zero causes a stop, but i never tryed.

Siemens S7, DT

tomhelliwell

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L D[AR2P#0.0]

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JesperMP

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jogibear9988

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L D[AR2P#0.0]

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L D[AR2P#0.0]

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jogibear9988

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