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How to use byte from symbolic defined bit adress in S7-1200

Created by: Annu at: 3/16/2013 12:28 PM (6 Replies)

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3/16/2013 12:28 PM	Rate (0)
Annu Posts: 12 Rating: (1)	Dear All, I am using S7-1200, TIA poertal v11 Sp2 with update 5. 8 bools are defined in Fc temp with symbolic addressing. Also i want to use this byte address for comparison then how to use it? I used %LB0. but in compilation it gives error.
Annu Posts: 12 Rating: (1)
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3/16/2013 12:38 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/6/2024 Posts: 6852 Rating: (1365)	Annu Dear All, I am using S7-1200, TIA poertal v11 Sp2 with update 5. 8 bools are defined in Fc temp with symbolic addressing. Also i want to use this byte address for comparison then how to use it? I used %LB0. but in compilation it gives error. Hello , Can we see what kind of error you got and your codes? It is recommended to write in TEMP area before read them Plus you have option of copying all binary addresses in different bit-position you want in an arbitrary Byte address and then compare the result. Best regards Hamid Hosseini
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3/16/2013 1:21 PM	Rate (0)
Annu Posts: 12 Rating: (1)	I m attaching the S/W program image file, which will elaborate my querry. Attachment S7-1200 Error.JPG (796 Downloads)
Annu Posts: 12 Rating: (1)
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3/16/2013 2:16 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/6/2024 Posts: 6852 Rating: (1365)	Annu I m attaching the S/W program image file, which will elaborate my querry. Hello again, It is clear that absolute addressing is not possible for Temporary local data.I consulted Hans Berger's Book for S7 1200 and it is also emphasized that point (4.3.6 Use of temporary local data). As a solution , you can reset (or set) all bit manually by coils.For that case define an always false signal and transfer it when required.I think you can use the out element for several symbolic tags in parallel. I hope that helps Many regards-Hamid Hosseini
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3/16/2013 3:07 PM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 10/8/2024 Posts: 1522 Rating: (228)	Annu Dear All, I am using S7-1200, TIA poertal v11 Sp2 with update 5. 8 bools are defined in Fc temp with symbolic addressing. Also i want to use this byte address for comparison then how to use it? I used %LB0. but in compilation it gives error. Hello Annu, Check this out ifit helps. - How in STEP 7 V11 can you access the unstructured data types bit-by-bit, byte-by-byte or word-by-word and symbolically?
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3/17/2013 5:50 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/8/2024 Posts: 4349 Rating: (1446)	Hi, My suggestion: deive your variable as byte and when you need to use bits, you use the notation: "name of byte variable".X0 (or x1, x2, ...x7).
	Denilson Pegaia Siemens Industry Sector Technical Support
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3/18/2013 6:47 AM	Rate (0)
Annu Posts: 12 Rating: (1)	Thanks to all .. So that means it is not possible to use byte from symbolic bools.. But possible to use bool from symbolic byte. ok problem will be solved. Thanks.
Annu Posts: 12 Rating: (1)	Last edited by: Annu at: 3/18/2013 6:50 AM
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