Dword comparation/conversion [Simatic S-300]

sinkoviak · Apr 15, 2016

Hello,

i have a DWORD number, which i need to compare in simatic s-300. How can i convert it to DINT. It seems that MOVE order does not working.

Basically what i need is a SET marker when the DWORD value is bigger than zero.

How can i programm it, please help me.

Thank you all!

Simon

Jeebs · Apr 15, 2016

Your issue is with Type checking.
Either redefine the DWORD variable as DINT.
Or disable Type Checking in the LAD/STL/FBD-editor.
(Options > Customize > LAD/FBD > Type Check of Addresses)

Diameter157 · Apr 15, 2016

Could you explain more exactly what you need?
I'm guessing you have a hex value in a doubleword and want to compare it to a doubleint value that is sometimes zero?

I attached a simple program that compares to the value 16, there isn't a need to convert though. In the simulator you can display it as a decimal or hex.

You just need to drag the compare block from the right side of the screen.

sinkoviak · Apr 18, 2016

TNX for answers, Jeebs and Diameter157.

What I have is a piece counter ''RealizedQuantity'', which is stored in DB adress and it is a DWord type [hex value]. I need to know, when the counter is bigger than 0.
Seems that the best solution would be to use a comparator to compare the ''RealizedQuantity'' number with 0, but im having problem with it. Is it even possible to convert DWord to Integer in S-300, to be able to use comparator?

I tried this, its working in simulator, but not on the machine:

L ''RealizedQuantity'' [DB100.DBD114]
T ''RealizedQuantityDINT'' [DB101.DBD36 - created a new adress DINT]
NOP 0

L ''RealizedQuantityDINT''
L ''DINT_0'' [DB101.DBD40 - L#0]
> D
= M 253.5

Any ideas? Thank you...

wimpiesplc · Apr 18, 2016

sinkoviak said:
TNX for answers, Jeebs and Diameter157.

What I have is a piece counter ''RealizedQuantity'', which is stored in DB adress and it is a DWord type [hex value]. I need to know, when the counter is bigger than 0.
Seems that the best solution would be to use a comparator to compare the ''RealizedQuantity'' number with 0, but im having problem with it. Is it even possible to convert DWord to Integer in S-300, to be able to use comparator?

I tried this, its working in simulator, but not on the machine:

L ''RealizedQuantity'' [DB100.DBD114]
T ''RealizedQuantityDINT'' [DB101.DBD36 - created a new adress DINT]
NOP 0

L ''RealizedQuantityDINT''
L ''DINT_0'' [DB101.DBD40 - L#0]
> D
= M 253.5

Any ideas? Thank you...

First I think the move from your "dword" to "dint" does nothing special, their bits are the same, only the representation is different.
what values do you see when monitoring online the 'real' plc? are you sure this db101.dbd40 is 0? and why use a variable and not l#0 directly?

KalleOlsen · Apr 18, 2016

If some blocks in this CPU has been converted from Step5, it is a possibility that the MB's from 200 to 255 is used as scratchpad memory. Try to use a free Marker outside that range.

And this code must work:

CLR
L "RealizedQuantityDINT"
L L#0
> D
= AFreeMarker

Kalle

sinkoviak · Apr 19, 2016

Tnx for help.

I did what you said, Kalle and if i monitor it online, it seems OK. I an adding the FP and NP for set/rst of merker M 199.3. Does this seems OK to you?

L ''RealizedQuantity'' [DB100.DBD114]
T ''RealizedQuantityDINT'' [DB101.DBD36 - created a new adress DINT]
NOP 0

L ''RealizedQuantityDINT''
L L#0
> D
= M 199.0

A M 199.0
FP M 199.1
S M 199.3

A M 199.0
FN M 199.2
R M 199.3

sinkoviak · Apr 19, 2016

Or it's better that way?

KalleOlsen · Apr 19, 2016

If you manipulate M 199.3 elsewhere in your program, it is OK.

If it is manipulated only in this segment, the FP and FN are unnecessary.

Kalle

sinkoviak · Apr 20, 2016

No, i use the M199.3 further in the program. It's working fine. Tnx for help.

Dword comparation/conversion [Simatic S-300]

sinkoviak

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Jeebs

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Diameter157

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sinkoviak

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wimpiesplc

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KalleOlsen

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sinkoviak

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sinkoviak

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KalleOlsen

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