RSLogix 5k question

briana banks · Oct 9, 2006

Hi All

Is there any uniqe instruction to reset array of boolean ?

Thanks

rPraveenkum · Oct 9, 2006

Use FLL or copy Instructions with zero

GeoffC · Oct 9, 2006

I didn't think those instructions worked with the BOOL datatype
When I had to do use BOOL arrays I ended up having to write subroutines to handle shifting, clearing, copying etc. Used a loop to step through each bit.

RSL · Oct 9, 2006

Copy will work you just have to get the source and destination defined correctly.

I have never tried FLL.

RSL

briana banks · Oct 9, 2006

COP and FLL only works on array of integer.

Thomas · Oct 9, 2006

words

I believe as long as you consider your array of bools as words, the cop or ffl should work. (It does on the plc5.)

ryan100980 · Oct 9, 2006

i generally use a MOV function moving a 0 to the word that you wish to zero or if you want to do specific bits of a word under given conditions then use a MVM

Money4Nothing · Oct 9, 2006

If you are using an array of boolean data types because you have a need for indirect addressing, you will probably have to reset the hard way. If not, I would recommend using an array of some custom data types. I think that COP instructions work on these.

$

BMLLER6758 · Oct 9, 2006

I am Sorry, but is there a reason to use a boolean Array ???

I allways use a normal DINT and use then the 32 Bits as Bits.

mellis · Oct 9, 2006

Kudos to Money4Nothing, that actually works.

Simply create a UDT that contains a bool array of whatever length you need. Create two tags of that UDT type. Leave one populated with zeros. When you need to clear, COP the empty one to the working one.

UDT name bool128 as an array of 128 bools. (I named the element bool128 too)
my_boolarray as type bool128.
empty_boolarray as type bool128.

COP empty_boolarray my_boolarray 1

Should do the trick.

The tagname may look a little odd...

Instead of my_boolarray[0], you get something like my_boolarray.bool128[0].

RSL · Oct 10, 2006

I went back and looked at an application I did using COP to populate a bool array. It was indeed an array of bools, but in a UDT. I used DINTS to fill it and the destination was a bool array, but it was a UDT bool array.

Sorry, My bad.

RSL

RSLogix 5k question

briana banks

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rPraveenkum

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GeoffC

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RSL

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briana banks

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Thomas

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ryan100980

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Money4Nothing

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BMLLER6758

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mellis

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RSL

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