scale & 1747-SN question

Terry Boblitt · Oct 10, 2008

I'm installing 3 scale units & a 1747-SN card. The processor is a 5/03. Setting up the communications was very easy. My ?? is when the scale see's a negative number the PLC see's it as positive number. How do you correct the issue?
Thanks Terry
scale #1====I:12.0 mov to F8:1
scale #2====I:12.2 mov to F8:2
scale #3====I:12.4 mov to F8:3

fuzzy logic · Oct 10, 2008

Just a question:
Why do you move to a Floating Point ?

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Terry Boblitt · Oct 10, 2008

I move to F8:1 then I mul times .1 so I can weight up in 10's of a pound. I figured this was the simplest way??? Willing to learn something new.........Terry

fuzzy logic · Oct 10, 2008

Ok Terry, I understand the why... :nodi:

So, I think the problem is relating to how the data is formatted in the scale; I mean, do you have a manual where is indicated the range of the number the scale put inside your input?

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Terry Boblitt · Oct 10, 2008

I'm using a Rice Lake 520 w/AB remote I/O setup. Haven't found nothing yet. What ever the scale see's + or - the plc see it as a + number.

fuzzy logic · Oct 10, 2008

Terry, I suggest you to go to Rice Lake site and register to be able to download docs.
I think it is necessary to understand how the datas are formatted inside your Input Address (Integer Numbers in SLC are in 2's complement binary data type, so that bit 15 is the sign).

Maybe you need to read the value as Unsigned; or maybe the scale gives you 2 Integer to be transferred in one Floating.

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Terry Boblitt · Oct 10, 2008

Good morning Mickey..

The scales have an AB remote I/O card inctalled. All of the scales are daisy channed together and tied into the 1747-SN card.I do see all of the scales in the logic but they logic don't see -

Mickey · Oct 10, 2008

Terry Boblitt said:
Good morning Mickey..

The scales have an AB remote I/O card inctalled. All of the scales are daisy channed together and tied into the 1747-SN card.I do see all of the scales in the logic but they logic don't see -

I had second thoughts after I posted, so I deleted my post.
Sense I have no knowledge of your weighing systems I should not stick my nose into this. Sorry for any confusion.

scale & 1747-SN question

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