Use SFC20 in FC

S7PP · May 25, 2011

Hi Guys,

I defined OUT1 as an UDT, I want to transfer data to it.

Why am I not able to use a SFC20 to copy block in an FC? I know I can do it in FB.

Is there any way to do it in FC?

Thanks a lot.

KalleOlsen · May 25, 2011

Hi!

S7PP said:
Hi Guys,

I defined OUT1 as an UDT, I want to transfer data to it.

Why am I not able to use a SFC20 to copy block in an FC? I know I can do it in FB.

Is there any way to do it in FC?

Thanks a lot.

I guess it has to do with the IO parameters on an FC being pointers. Perhaps you get an extra pointer level?

If you BLKMOVE to a similar structure in the L-area and do L / T to the outputs, it should func, I think.

Kalle

S7PP · May 25, 2011

Thanks Kalle, it sounds complicated to me. I gave it up, I'll use FB instead. Thanks anyway.

L D[AR2P#0.0] · May 25, 2011

Load/Transfer loop required in FC. See example project.

FC parameters are passed by pointer hence SFC20 will not accept an FC parameter as an argument.

FB parameters are passed by value (except an INOUT of type UDT) hence SFC20 can be used as the parameter can be defined as an absolute address.

S7PP · May 26, 2011

That's very cool. I have to learn this pointer and any data type. I'm not used to deal with it yet.

Thanks a lot. You always have a solution. Great!

Use SFC20 in FC

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L D[AR2P#0.0]

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