&Novice

TT pulse bit

12 posts in this topic

Dealing with programs with TT pulse On/Off bits which am battling to find the timers they are from, anyone with information as to how I go about this. Cross referencing is not helping as I am only getting the bits location. The program has got some batch programming which am not very much familiar with on top of the usual LAD

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Posted (edited)

What PLC are you using?

Is that the complete address, just "TT"? A little more info and maybe post the program if you can.

Edited by Mickey

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Please see attached the rung and where the cursor is...

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7 hours ago, &Novice said:

Please see attached the rung and where the cursor is...

No attachment, try again.

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Sorry please see attached. And when I cross reference is get the other screen shot...

1493106938467-417966055.jpg

1493106958574-1234030634.jpg

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Sorry, but I cannot see that.

 

Maybe if you post the program, someone with that software will be able to help. It appears to be a Logix5000 program.

I do not have that software.

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Search for the base timer name without the '.TT'

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If you do a cross-reference on the x.TT bit, it should show the timer instruction.  You're looking for TON, TOF, etc. under the "Element" column.  Here's an example I ran by rt-clicking on an instruction that was using SnubberDown_Time.EN.

TimerEN-Bit.thumb.PNG.286ca386d8b812fa67

You should get a similar result for your TT bit.  In this case, it's used as an on-delay timer (TON).

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1493106958574-1234030634.thumb.jpg.693541493106938467-417966055.thumb.jpg.7a4f31Good day all, been hectic. Please see attached a video clip of the coding and how I am doing the search for the timer. Also please note that the code has got phase managing in it

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1493106958574-1234030634.thumb.jpg.693541493106938467-417966055.thumb.jpg.7a4f31Good day all, been hectic. Please see attached a video clip of the coding and how I am doing the search for the timer. Also please note that the code has got phase managing in it

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Cross referencing takes me to 4 locations and of the 4, 2 are MOV instructions and the other 2 are XIO/XIC

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If those are really the only places in the code where that timer address shows up, it's not being used.  The XIO/XIC instructions will never change state without there being a TON/TOF/RTO instruction somewhere.  The MOV instructions probably set up the timer preset and maybe the accumulator, but I can't really tell from your picture.

If you can post the ACD file (or send it via PM or email), that would help one of us help you.

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