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Double Coil Warning

Created by: Lucky123 at: 6/26/2012 1:47 PM (8 Replies)

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6/26/2012 1:47 PM	Rate (0)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/25/2022 Posts: 556 Rating: (236)	Is there any way to check double coil in Step 7 software. Like in RSL5000 we can get a warning if there is a double coil exist in the program. I just want to know, if we have similar options available in S7.

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6/26/2012 2:01 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (707)	Hello, What do you mean by double coil? Please explain a bit more the question. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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6/26/2012 2:11 PM	Rate (0)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/25/2022 Posts: 556 Rating: (236)	Two places a digital output or databit is written. Two places equal to instruction is used for the same output.

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6/26/2012 2:15 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (707)	Hello, O.k. ,well there is no warning if you write same outputs at more then one point in program, it is allowed in S7, (not wise to do). Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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This contribution was helpful to 1 thankful Users Lucky123

6/26/2012 2:19 PM	Rate (0)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/25/2022 Posts: 556 Rating: (236)	Ok. it means if someone forgets to carefully write the program and use equal to instruction for one discrete output at multiple places, it can get messier. I wish their could be a way to determine that during compilation or downloading the program to PLC.

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6/26/2012 5:50 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 6/3/2023 Posts: 12033 Rating: (2595)	Hello Lucky; There are tools in Step 7 to search through your program. It is wise to look them up at regulatr intervals while programming: - X-references - the "GoTo" function (when selecting an address in the program editor). Hope this helps, Daniel Chartier

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6/26/2012 6:52 PM	Rate (0)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/25/2022 Posts: 556 Rating: (236)	Daniel, Yes, I do use those tools, however, it is bit time consuming to find out the double coil, if the program contains too many output bits.

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6/27/2012 6:45 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 6/3/2023 Posts: 2966 Rating: (1025)	Hello Lucky123 X-ref has some usefulfilter functions which makes it easy to spot double assignments and also comes in handy to for example find out if an Timer or Counter has accidentally been double assigned. All you have to do is to open the Filter dialogue in the X-ref, select the type of address (e.g. Outputs)and then either useselection number 7 to only disaply multiply "=" assignments or number 2 if you also want to have for example "Set/Reset" assignments displayed. Attached is a pic which should help in make sense out of the above. Attachment S7 X-ref Filter.jpg (79 Downloads)
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 2 thankful Users Lucky123 nbk

6/27/2012 11:13 AM	Rate (0)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/25/2022 Posts: 556 Rating: (236)	fritz Hello Lucky123 X-ref has some usefulfilter functions which makes it easy to spot double assignments and also comes in handy to for example find out if an Timer or Counter has accidentally been double assigned. All you have to do is to open the Filter dialogue in the X-ref, select the type of address (e.g. Outputs)and then either useselection number 7 to only disaply multiply "=" assignments or number 2 if you also want to have for example "Set/Reset" assignments displayed. Attached is a pic which should help in make sense out of the above. Fritz, That really helped. I found three more double coil in my program, which I would have otherwise found while running the sequence eventually. Thanks a lot for letting me know this,earlier Daniel also mentioned the same, but I did really not know about point number 7, until you posted out the solution. Thanks once again. As always, Cheers! :)

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This contribution was helpful to 1 thankful Users fritz

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