scaling an analog input on Siemens CPU315

mlmccauley · Nov 6, 2007

I'm essentially new to Siemens (the last time I programmed one, the development app ran under DOS). I'm programming a CPU315-2DP in LAD. The program and the program structure is very simple, and I'd like to keep it that way. Is there a *simple* way to convert a word (IW) variable derived from a 4-20 input to engineering units i.e. a simple zero and span conversion?

I'm using Step 7.

Thanks!

Mike

LIV · Nov 6, 2007

Fc 105 "scale"

mlmccauley · Nov 6, 2007

LIV said:
Fc 105 "scale"

Thanks for the quick reply.

What threw me off on FC105 was that, in "Help", it stated that fuction is for processing input from the 6ES5 464-8Mxx series of modules, and my AI module is a 6ES7 331-7KF02-0AB0. Will FC105 work with that hardware?

Thanks again,

Mike

LIV · Nov 6, 2007

No problem. There is no difference what module is used.

mlmccauley · Nov 6, 2007

LIV said:
No problem. There is no difference what module is used.

Great!

Thanks again for the help,

Mike

L D[AR2P#0.0] · Nov 7, 2007

Mike,

It sounds like you are using the wrong FC105, you need the FC105 from the Standard Library in the TI-S7 Converting Blocks folder.

LIV · Nov 7, 2007

L D[AR2 said:
Mike,

It sounds like you are using the wrong FC105, you need the FC105 from the Standard Library in the TI-S7 Converting Blocks folder.

That's right.

zama · Nov 7, 2007

FC105 will scale analog input range -27647 to 27648 to -100% to 100%.

LIV · Nov 7, 2007

zama said:
FC105 will scale analog input range -27647 to 27648 to -100% to 100%.

Parameter BIPOLAR=TRUE range -27648 to 27648
BIPOLAR=FALSE range 0 to 27648

scaling an analog input on Siemens CPU315

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