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S7-Graph- How to add conditions in Actions??

Created by: shiv at: 11/26/2009 7:41 AM (4 Replies)

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11/26/2009 7:41 AM	Rate (0)
shiv Advanced Member Joined: 3/28/2008 Last visit: 8/2/2022 Posts: 38 Rating: (1)	Dear All I am using S7-Graph for my project. But i am not able to add any conditions in "Action". My requirement is that, if a step is active- depends on parameter value diffterent statements to be executed. "parameter" is a variable. i.e if step 100 is active action to be done is mentioned below. Action: if (parameter=1) execute statement 1,statement2 if (parameter=2) execute statement3,statement4 if (parameter=3) execute statement5,statement6 if (parameter=4) execute statement7,statement8 Is there any way in S7-Graph to implement this in single step?? Thanks in advance. Regards Shiv

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11/26/2009 8:25 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/21/2023 Posts: 2962 Rating: (1022)	Hello shiv My S7-Graph knowledge is somewhat rusty (haven't used it for a while and wouldn't call myself a power user of it either), but one way I could think of is this: Programa "normal" FC or FB (e.g. in STL, LAD, FBD or SCL) and make ithandle the "execute statement 1,statement2" etc. conditions based on the value of an IN parameter. Once done simply call this FC/FB from your S7-Graph Step and pass on the "parameter" value. I hope this helps and perhaps somene out there may have a better or simpler idea.
	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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12/1/2009 7:36 AM	Rate (0)
shiv Advanced Member Joined: 3/28/2008 Last visit: 8/2/2022 Posts: 38 Rating: (1)	Thank you fritz. I too thought about the same thing. Then i will be deviating from S7-Graph. Before doing this i was searching for availiable options within S7-Graph. I will then go ahead with a function. Thanks & Regards Shiv

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12/1/2009 8:53 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/21/2023 Posts: 2962 Rating: (1022)	shiv I too thought about the same thing. Then i will be deviating from S7-Graph. Hello again shiv Calling an FC of FB from within a Step is allowed in S7-Graph so you are strictly speaking not deviating from it. You are however "loosing" out on being able to visualise what going on inside that Step by simply looking at the S7 Graph sequence. You originally said that "different statements are to be executed dependingon a parameter value" and that you'd like to do so in a single Step. If you were to let go of the single Step requirement though, you can utilise the so called "alternative branch" for this quite easily and would as such no longer be "deviating" from "pure" S7-Graph display. Attached is a quick and nasty example on how this would/could look like. Ihope this helps and good luck with your project Attachment S7 Graph Sequence with 4 alternative branches.jpg (229 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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12/2/2009 5:08 AM	Rate (0)
shiv Advanced Member Joined: 3/28/2008 Last visit: 8/2/2022 Posts: 38 Rating: (1)	Hi fritz I got it now. Thanks for the help. Regards Shiv

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