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Getting address(GHOST ALARM) out from a range of Bool alarms

Created by: KayBee at: 6/28/2011 8:00 PM (2 Replies)

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6/28/2011 8:00 PM	Rate (0)
KayBee Posts: 241 Rating: (7)	Dear Experts, I want to know the bit level address from a range of Bool variables in a Data Block.When a Bit is become OFF to ON that time I want that address to know. I must say why I am asking this is due trouble finding a alarm that activating Horn every time a alarm get active but we don't recieve any Text message for the alarms. Now I have more than 800 alarms and it is very annoying to check all the Tag address for each alarms in the Intouch Scada. I have checked most of the PLC digital address that but now I think I need this automatic way to find out the GHOST/UNKOWN ALARM. I was thinking to impliment by using some kind of pointer function, but exactly where to start and which type of pointer application will be best for this application? Any idea
KayBee Posts: 241 Rating: (7)
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6/28/2011 9:25 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 3/9/2023 Posts: 231 Rating: (23)	Hi Powertags Just one ideia, what about using a logic with one-shot and the SFC20 to copy the alarm area of your Data Block to an mirror DB (a new DB just for debugging), then you look for the bit it is on.

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6/28/2011 9:45 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/15/2025 Posts: 12328 Rating: (2698)	Hello PowerTags; You should look at the following thread, especially Smiffy's excellent work. Even experienced programmers are often surprised at the intricacy of code required for bit twiddling applications such as the one you intend to do. Smiffy'slast post (on page 2)proposes a CASE instruction (in SCL) to test which bit is set in a word, so it could give you some indications on how to run your application. Of course if you have many consecutive words to test then indirect addressing is a must, so study his preceding replies. /tf/WW/en/Posts/44542 Hope this helps, Daniel Chartier

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