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Define tag of process image

Created by: Milosh at: 1/23/2012 2:31 PM (8 Replies)

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1/23/2012 2:31 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 9/12/2023 Posts: 635 Rating: (12)	Hi all. I need information how to immediate acces analog address? I read manual but how to add tag in symbol table for process image? In s7 300 address defined as PIW200, here I can define address IW200, Data type Int and Name like Pressure:P to immedate read address value. Right??

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1/23/2012 2:40 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/3/2023 Posts: 13759 Rating: (2244)	Not 100% sure, but for regular I/O, it's I0.0:P and Q0.0:P. So, you are right in thinking it should follow that analog input @ word 200 should be something like IW200:P I do not think you can use symbolic name to access the process image directly for TIA Portal on S7-1200. Perhaps it is different in the pro version for S7-300/400. For now, just try the IW200:P. What are your input filter settings and how fast can your analog input actually change relative to PLC scan time? If you set up a cyclic OB to scan the input image at precisely the same rate as your input update rate, you get optimal analog input data. Any faster is probably just wasting cycle time.
	science guy
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1/23/2012 3:15 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 9/12/2023 Posts: 635 Rating: (12)	I do that like on pictures attached. Is that correct? Attachment tag table.jpg (422 Downloads)

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1/23/2012 3:16 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 9/12/2023 Posts: 635 Rating: (12)	And in proggram... Attachment main.jpg (414 Downloads)

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1/23/2012 3:34 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/3/2023 Posts: 13759 Rating: (2244)	Looks right to me. Does it work like you expect / need?
	science guy
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1/23/2012 3:57 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 9/12/2023 Posts: 635 Rating: (12)	I will try tommorow and inform...PLC not yet arrived :)

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1/24/2012 4:53 AM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 10/1/2023 Posts: 1499 Rating: (220)	It should work, waiting to hear from you
	Like it? Rate it!
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1/24/2012 5:51 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 9/12/2023 Posts: 635 Rating: (12)	HI friends. I tried today and it's work. Best regards

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This contribution was helpful to 3 thankful Users O_Moderator 0_Einstein Ganes10

1/24/2012 8:23 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/3/2023 Posts: 13759 Rating: (2244)	Thanks for the feedback. :)
	science guy
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