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Explanation for some details within my code

8/23/2011 4:33 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/19/2024 Posts: 3027 Rating: (1057)	Very nice post indeed Aret as for this: Aret How will real PLC react for such pointer - unknown, so you have to cut it off. While I can't currently say how a real PLC will behave (don't have one handy to test), but PLCSIM does certainly "complain" about the "1" that is being shifted by the SRD 4 into the part of the pointers address area that should (or must) contain 0's. Attached is a pic which has two examples, one with using "IW 4"and one with using "PIW 4" as the FC's input Parameter. Note the AR1 address of 131072.2 that is created out of the SRD 4 of "IW 4"! Attachment Pointer memory area SRD4 example.jpg (216 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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8/24/2011 7:55 AM	Rate (0)
Aret Posts: 2348 Rating: (264)	Yep, in PLCSim it's significant bit. I guess on new PLC would be the same. But i'm unsure on behavior of "old" PLC's, because it didn't have addresses at 128k, so maybe this bit won't be significant.... Anyway such doubts are useless- just cut it off Both doubts and unwanted 1
Aret Posts: 2348 Rating: (264)
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