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S5 to S7 Prog Conver Blocks

Created by: Mohammed Kamran at: 3/27/2013 5:13 PM (1 Replies)

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3/27/2013 5:13 PM	Rate (0)
Mohammed Kamran Posts: 6 Rating: (0)	Dear All, I have a siemens S5 System CPU-103 and I am upgrading the existing S5 System to S7 300 (CPU 315-2DP) System, Iam in process ofconverting the existing program in the S5 System to S7 System during which I have a problem, there are some multiplication and division funtion blocks in existing S5 prog which cannot be converted completely. I have selectedconv blockFC 65 to convert multiplication function block from S5 to S7 and FC 66 conv block to convert division function from S5 to S7. Accordingly Iam attaching the screen shot of the S5 prog for multiplication function and S7 prog FC 6 network # 3 for your review. Kindly go through the attachment and tell me whether Iam using the correct blocks for conversion of S5 TO S7 multiplication and division functions and also inform me whatvaluesI have to fill according to the attached programs in the conversion blocks FC 65and FC66 to complete the conversion process. Your quick response will be highly appeciated. Thanks and Regards, Kamran... Attachment F:\S5 TO S7 CONV_PROG.JPG (172 Downloads)
Mohammed Kamran Posts: 6 Rating: (0)
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3/28/2013 7:48 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/9/2024 Posts: 3024 Rating: (1054)	Hello Mohammed Kamran my advise is to stay way clear of ALL blocks from the "S5-S7 conversion" library. For one, there is really no need to use these anymore as S7 has most of the functions available as inbuilt commands (certainly in your case, simply replace the Function call with the multiplication and division instructions). More importantly though, these "S5 legacy" blocksuse MB200 to MB 255 as scratchflags which can lead to unintended consequences in the S7 program if not being considered (FC65&66 use "only" MB200 up to MB207 which can be seen in the X-ref when you add these Blocks to the project). While scratchflags usage was the norm in S5 days, they have no place anymore in an S7 program as far as I'm concerned (where TEMP variables are availablefor this purpose). I hope this helps
	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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