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Reading/writing single bit of word (int, dint, ...) whish list

Created by: Marko Bursic at: 1/15/2011 6:03 PM (7 Replies)

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1/15/2011 6:03 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 3/15/2023 Posts: 1410 Rating: (146)	Hi all, Is there a simple way to access a single bit in a word or in an integer number? I know that this could be done by moving the integerto theMW memory and than access it with M bit, but I would preffer a special bit operator (contact and coil) with index. I think that everybody had the same wish at least once. Best Regards, Marko.

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1/17/2011 9:05 AM	Rate (0)
Chilly_Garfield Posts: 316 Rating: (37)	Hi Marko, you can do the action with Word-Comparisons: - AND ->"UW" (read or resetthe bit) - OR -> "OW" (setthe bit) - XOR -> "XOW".(toggle the bit) If you program in SCL then you can us an AT-view. http://support.automation.siemens.com/WW/view/en/21947945
Chilly_Garfield Posts: 316 Rating: (37)
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1/17/2011 10:50 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 3/22/2023 Posts: 4180 Rating: (1332)	Hi, Take a look also in FAQ: "How can you group separate signals (variables of the "Bool" data type) to one variable of the "Word" type and again extract them from that "Word" variable (Bool - Word data type conversion)?" http://support.automation.siemens.com/WW/view/en/41512047
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/17/2011 12:52 PM	Rate (0)
Tomy Master Gold Member Joined: 5/4/2009 Last visit: 11/9/2022 Posts: 906 Rating: (40)	Also you can use rotate instructions.
	Aim Higher
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8/7/2015 10:33 AM	Rate (0)
smhbyn Experienced Member Joined: 11/22/2014 Last visit: 1/29/2023 Posts: 1 Rating: (0)	Dear Denilson, Denilson Pegaia Take a look also in FAQ: "How can you group separate signals (variables of the "Bool" data type) to one variable of the "Word" type and again extract them from that "Word" variable (Bool - Word data type conversion)?"http://support.automation.siemens.com/WW/view/en/41512047 Could you kindly refresh this link? I cannot reach it, it is broken. Regards, Smh.

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8/7/2015 10:50 AM	Rate (1)
Jeremy Mahieu Posts: 101 Rating: (6)	Well in s7-1200/1500 you can. It's called Slice access and you can read about it in the Programming Guideline for S7-1200/1500 section 3.6.5. It would look something like MyTag.X5 . Although not indexable.
Jeremy Mahieu Posts: 101 Rating: (6)
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This contribution was helpful to 1 thankful Users Allen2

8/7/2015 12:20 PM	Rate (1)
BryanG2001 Posts: 113 Rating: (22)	It is kind of an old thread, and this will only work with non-optimised DB. from the manual - DB1.DBX2.3 gets you Bit 3 in Byte 2.
BryanG2001 Posts: 113 Rating: (22)
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2/11/2020 4:55 AM	Rate (0)
dr22 Advanced Member Joined: 9/10/2013 Last visit: 2/12/2023 Posts: 8 Rating: (0)	https://support.industry.siemens.com/cs/ww/en/view/57374718 #Word.%Xbit
	Last edited by: Jen_Moderator at: 02/11/2020 12:18:23 Optimized link.
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This contribution was helpful to 3 thankful Users faubts17 TimRowe1130 Alan Barros

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