Copy a DINT to BOOL[32] in rslogix5000

chrisk_81 · Oct 27, 2011

Hi All,

Can anyone tell me how I would go about copying or moving a DINT into an array of 32 Boolean values in rslogix5000?

I've tried using the COP and MOV instruction to no avail.

DamianInRochester · Oct 27, 2011

Consider just referencing the DINT at the bit level rather than making an array of 32 booleans. The processor will handle it much more efficiently.

rdrast · Oct 27, 2011

Aye, this one begs the "Why" part. There are ways to do that, but they really don't gain you a lot. One place that I do something like that a lot, is taking a DINT status word from a device, and breaking it down to named bools, but I do that with UDT's*, and it is just a simply COP there.

*Okay, not actually "Simply", you need to externally edit the UDT to give names to the individual bits, but workable.

chrisk_81 · Oct 27, 2011

DamianInRochester said:
Consider just referencing the DINT at the bit level rather than making an array of 32 booleans.

yes but that won't work in this instance.

I have Alarm

INT and Index

INT where Index is always between 0 and 31. I want to reference Alarm.Index but rs has a dummy spit. If I had Alarm[32]:BOOL then Alarm[Index] would work fine I presume.

Any ideas?

DamianInRochester · Oct 27, 2011

chrisk_81 said:
yes but that won't work in this instance.

I have AlarmINT and IndexINT where Index is always between 0 and 31. I want to reference Alarm.Index but rs has a dummy spit. If I had Alarm[32]:BOOL then Alarm[Index] would work fine I presume.

Any ideas?

Use this syntax.

AlarmInt as DINT array
AlarmIndexNum as DINT
AlarmBitNum as DINT

Say you want to reference a XIC in the 3rd element and the 5th bit.

Mov 2 to AlarmIndexNum
Mov 4 to AlarmBitNum

AlarmInt[AlarmIndexNum].[AlarmBitNum]

You just have to put your indirect reference inside square brackets for the bit reference. It works like a charm.

chrisk_81 · Oct 27, 2011

DamianInRochester said:
AlarmInt[AlarmIndexNum].[AlarmBitNum]

You just have to put your indirect reference inside square brackets for the bit reference. It works like a charm.

This looks promising. I probably tried every variation of syntax except this one. I will try and let you know.

DamianInRochester · Oct 27, 2011

chrisk_81 said:
This looks promising. I probably tried every variation of syntax except this one. I will try and let you know.

What .... you don't trust me?

TConnolly · Oct 27, 2011

Its an advanced topic but search the forum for "bit overlay" for a way to use a DINT instead of a BOOL array and at the same time have a name for each bit in the DINT.

chrisk_81 · Oct 27, 2011

DamianInRochester said:
What .... you don't trust me?

Didn't doubt you for a minute

your solution worked beautifully btw.

fireleon12 · Jul 6, 2017

awesome

I dont usually post anything, i wasnt even registered here, but i had to thank you DamianInRochester, awesome!

Claus Nielsen · Jul 7, 2017

As an addition to use indirect adressing for storing alarm bits in some kind of integer array I suggest creating an UDT using bit overlays for making descriptive names for each alarm.
This is very usefull when debugging a program.

Here is a link to an example UDT I made.
I made some comments in the xaml file and I suggest opening it with e.g. Notepad++ to review these.
https://www.dropbox.com/s/8js8ezhsmqovvcx/BitOverlayExample.L5X?dl=0

edit:
Will just mention for anyone not knowing that now the descriptive boolean member will reflect the state of the target bit in the backing tag and the other way around.

iroxusux · Mar 10, 2020

chrisk_81 said:
Hi All,

Can anyone tell me how I would go about copying or moving a DINT into an array of 32 Boolean values in rslogix5000?

I've tried using the COP and MOV instruction to no avail.

Late to the party, but i've done this before with a simple FOR loop for an OPC vision system that didn't handle elements of an integer but it COULD handle arrays of booleans.

Preferably in STL:

To go from Bool Array to DINT

DintValue := 0
FOR Control := 0 TO 31 BY 1 DO
IF BooleanArray[Control] THEN
DintValue := DintValue +(2**Control );
END_IF;
END_FOR;

To go from DINT to Bool Array

FOR Control := 0 TO 31 BY 1 DO
BooleanArray[Control] := DintValue.[Control];
END_FOR;

You could apply the same in ladder with jump labels or maybe an FAL if you were trying to be fancy, but it's more resource intensive on the processor and you lose efficiency.

Hopefully this helps someone else who comes along!

Copy a DINT to BOOL[32] in rslogix5000

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