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S7 1214C, using PEEK on High Speed Counter

Created by: B3mt1 at: 12/11/2014 10:15 AM (6 Replies)

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12/11/2014 10:15 AM	Rate (0)
B3mt1 Posts: 3 Rating: (0)	Hi, I have question about using PEEK on High Speed Counter, it doesn't work for me :) [code]#Measured_Value := PEEK(area:=16#81, dbNumber:=0, byteOffset:=#Speed_Counter_Input_Byte); #Measured_Value := "HSC";[/code] Adress of HSC is %ID1000 and Speed_Counter_Input_Byte is 1000. But with PEEK i get 0, but with second line i get the frequency (as I have put it configuration). See attachment for monitored values and code. CPU in question is 1214C ------------ New subject after splitting from SCL programming in S7-1200. Attachment Untitled.jpg (72 Downloads)
B3mt1 Posts: 3 Rating: (0)	Last edited by: Min_Moderator at: 12/11/2014 11:00 AM Splitted Last edited by: B3mt1 at: 12/11/2014 10:16 AM
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12/11/2014 10:34 AM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 6/9/2023 Posts: 634 Rating: (123)	Hi B3mt1! PEEK() gives you back IB1000 not ID1000. It is a byte read.
	ALPHR Technology Europe
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12/11/2014 10:56 AM	Rate (0)
William_B Posts: 5225 Rating: (1170)	In the name of Good Sanity would you want to use the PEEK functionality for this? ^Why? If it is a more immediate read that you need to make.. ~~P:ID1000~~ ID1000:P w
William_B Posts: 5225 Rating: (1170)	Last edited by: William B. at: 12/11/2014 4:15 PM Thanks to huggy_d1. Incorrect notation with strikethrough and corrected in italic bold.
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12/11/2014 11:17 AM	Rate (0)
B3mt1 Posts: 3 Rating: (0)	In the name of good sanity I have gave up of using PEEK function for this But just to clarify, how I can get double read with PEEK ? EDIT: solved it, thank you for pointing my error :) [code]DWORD_TO_INT(PEEK_DWORD(area:=16#81, dbNumber:=0, byteOffset:=#Speed_Counter_Input_Byte))[/code]
B3mt1 Posts: 3 Rating: (0)	Last edited by: B3mt1 at: 12/11/2014 11:25 AM
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12/11/2014 12:01 PM	Rate (0)
William_B Posts: 5225 Rating: (1170)
William_B Posts: 5225 Rating: (1170)
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12/11/2014 3:26 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 6/9/2023 Posts: 13374 Rating: (2185)	B3mt1 In the name of good sanity I have gave up of using PEEK function for this But just to clarify, how I can get double read with PEEK ? EDIT: solved it, thank you for pointing my error :) DWORD_TO_INT(PEEK_DWORD(area:=16#81, dbNumber:=0, byteOffset:=#Speed_Counter_Input_Byte)) While you have solved your problem, I think you should follow W.B.'s advice and access the counter value using the ID1000:P immediate tag. If you assign ID1000 to myHSC1, you can use myHSC1:P as a shortcut that still keeps your access symbolic rather than as a hack into the memory of the plc.
	science guy
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This contribution was helpful to 1 thankful Users William_B

12/15/2014 1:07 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 3/15/2023 Posts: 1410 Rating: (149)	In my opinion you simply get a snapshot of counter value (input partition image) with this peek, not the actual counter value. The right wayis what William told you - peripheral access, more starigtforward and exact, however you can use also an algorithem with peek if it makes youfun.

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This contribution was helpful to 1 thankful Users William_B

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