CLGX 5000 Binary to Decimal

[zerokewl]

New to rslogix 5000. so forgive the simple questions.
I want to read a set of inputs as a binary into logix 5000?
Is there a special inst. set I can use?

Thank you

 

[bernie_carlton]

Your question could be interpreted a number of ways.
Can you give an example of what you have (the inputs) and the final form you want?

 

[zerokewl]

Yes, I have a 1796-IB16 on a 1794-Ethernet, I am reading all inputs from this module into logix 5000. what I am trying to do is read these as Binary or convert them to a decimal value from Binary. For example I have Inputs 7.0, 7.1,7.2 as 7.0 = 1, 7.1 = 2, 7.2 =4, so on, want to read the first 7 and display as Decimal code, almost like a mask move, I know the terminology but am not sure with the instructions.
Thanks for reading

 

[Ron Beaufort]

unless I'm just misunderstanding what you're asking for, the MVM that you mentioned should do the trick (as shown in the attached figure) ... the tag shown as the Destination is a DINT ...

if not, then we need more detail ...

 

[zerokewl]

Nice, Thank you Ron. Makes sense!
What Data Type is your TAG you created?

 

[Ron Beaufort]

weird ... I just added that info as an "edit" - while you were "editing" to ask the question - that I was answering before you asked it ...

 

[zerokewl]

weird ... I just added that info as an "edit" - while you were "editing" to ask the question - that I was answering before you asked it ...

^^ Yes that is ironic! Here is what I am getting my TAG is a DINT,
reading the values correctly just having problems displaying.
Thanks for your time!

 

[Ron Beaufort]

I'll check this out in the lab later today, but for now just try putting the 2# code in front of your mask entry ... my hunch is that the MVM thinks your mask is a "decimal" number - instead of a "binary" number ...

also, making your TESTID Destination an INT instead of a DINT might help ...

as I said, I'll check it later (I'm tied up on other projects right now) - but I'd bet (pocket change only) that the suggestions above will fix it up ...

edit: I just got some extra time - and mine is working with the 2# code in front of the mask ... using a DINT or an INT as the Destination isn't making any difference (one way or the other) on my setup ...

BUT ...

make SURE that any previous "test value" in your Destination has been set to all ZEROs before you use the MVM ... hint: the MVM won't reset any "unused" bits that have already been set to a ONE status by a previous "test run" ...

 

[zerokewl]

Thats what it was, Thanks Ron for all your help. You were correct on the MVM not resetting any "Unused" bits!
Put a 2# and created a whole new DINT Tag and it gave me the correct number right away, now I just need to
figure out how I can populate the destination with all Zero's before it re-scans again and I dont have the same issue!

Thanks once again, appreciate your time.

 

[Ron Beaufort]

just use an MOV (Move) instruction to put a ZERO in the Destination box just BEFORE you do the MVM to rewrite the latest value ...

glad we were able to help ...

 

[bernie_carlton]

Or possibly, as discussed in another topic, just use the AND instruction. That may do what you want without the preliminary clearing of the destination.

 

[zerokewl]

Ron:
Thanks I will try that out.

Bernie:
How would I make use of the AND instruction ?
Thanks

 

[bernie_carlton]

1. Read the definition of the AND instruction in the instruction help.

2. Use it in palce of the MVM. The clearing of the target will not be necessary as the AND instruction will affect all the bits of the target.

 

[zerokewl]

I don't think an AND instruction will help here, because I am trying to get a decimal value out of a binary, and using a AND instruction will give me a different read when it changes my target numbering.

 

[bernie_carlton]

Just try the AND function.