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How to copy data block in SCL

Created by: prasad.sawantdesai at: 7/5/2013 10:49 AM (21 Replies)

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10/20/2014 7:04 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 8/24/2023 Posts: 1347 Rating: (228)	Hi, Thank you for the detailed response. Actually I tried it but it does not compile as: pAnySRC.ByteAddressMSB := (Address AND 16#0700); // Only take bottom 3 bits of 3rd byte (bits 16-18) That is a byte. but the variable DWORD pAnySRC.ByteAddressLSB := (Address AND 16#FFF8); // Only take bits 3-15 (stripping out the bit address) That is a WORD. but the variable DWORD Is there any way to fix this issue? Maybe the original version will do for me as I only 64 words in the DB. I am still not too sure about how is it working if the bit addresses hold actually 3 bits of the byte address. I hope I did not ask anything really silly. Cheers
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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10/21/2014 9:58 AM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 9/11/2023 Posts: 646 Rating: (126)	Hi MicroMan Maybe the attached tables would help you. I was also confused about the addressing difference between that from the table and what smiffy uses, but it was simple after I've read this: smiffy "So to give you a 0-65535 address range with byte addressing you will need 16-bits, but as it is bitwise addressing you actually need a 19-bit address (65536 * 8 = 524280 = 2^19 = 19 bits). ...... The low address (ByteAddressLSB) handles the address range of 0-2^14-1 = 0 - 16383 The high address (ByteAddressMSB) handles the address range of 2^14 - 2^16 = 16384 - 65535." He uses bitwise addressing in his function, not the form from the picture. (byte address.bit address) E.g. if you want to point to the 33rd bit in a DB you just write 32 into ByteAddressLSB, do not have to construct an address like 4.0 (byte 4 bit 0 which is the 33rd bit) If you look at the binary format, both are the same: 32 decimal in binary is 100000 while 4.0 byte address 4 decimal is 100 while bit 0 is 000 = 100000 So if you want to work with words, and you want to point e.g. to the 3rd word in your local, you should write into thepAnyDST.ByteAddressLSB 2x16 = 32 I hope I understood it well. Attachment ANY pointer.JPG (404 Downloads)
	Last edited by: Kahl at: 10/21/2014 10:44 AM Last edited by: Kahl at: 10/21/2014 10:43 AM pAnyDST added ALPHR Technology Europe
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10/21/2014 10:10 AM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 7/28/2023 Posts: 1525 Rating: (527)	Maybe you will need to convert the DWORD result to the correct type before the assignment. pAnySRC.ByteAddressMSB := DWORD_TO_BYTE(Address AND DW#16#0700); pAnySRC.ByteAddressLSB := DWORD_TO_WORD(Address AND DW16#FFF8); >I am still not too sure about how is it working if the bit addresses >hold actually 3 bits of the byte address. The bit address is not holding 3 bits of the bytre address, they have been bit shifted left by 3 bits curtiousy of the 8 calculation leaving the bit address as 0. Each 2 = 1 bit shift towards the high end of the word. So 3 bit shifts would be 2 * 2 * 2 = 8. But as the LSB only holds a word, you will effectively lose the top 3 bits off the top of this word. So the bits that are shifted out the top of the LSB really ought to go into the MSB to give you the full range of addressing. As it is now, you will lose the top 3 bits and therefore reduce your address range as already explained. But as you are not using large addresses, we can simply ignore the top 3 bits and keep the MSB as 0. Note to kahl: The bit address has to be 0 in this case as he is using BLKMOV, which will fail if the address is not byte alligned (i.e. bit address is 0).
	Last edited by: smiffy at: 10/21/2014 12:58 PM Last edited by: smiffy at: 10/21/2014 10:13 AM Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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10/21/2014 1:16 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 8/24/2023 Posts: 1347 Rating: (228)	Hi, My conclusion : //Initialize the ANY pointer pAny.S7Code:=16#10; //specification of the syntax ID pAny.DataType:=16#2; //code for the data type 2 FOR byte pAny.Length:=COPY_LEN; //repeat factor pAny.DBNumber:=DB_NUM; //number for data block pAny.MemoryArea:=16#84; pAny.ByteAddressMSB:=DWORD_TO_BYTE(SHR(IN:=(INT_TO_DWORD (BYTEADDR)),N:=13));//MSB pAny.ByteAddressLSB:=DWORD_TO_WORD(SHL(IN:=(INT_TO_DWORD (BYTEADDR)),N:=3));//LSB Thank you for all the help. It was a great help all week. Best Regards:
	Last edited by: MicroMan at: 10/25/2014 6:20 PM Last edited by: MicroMan at: 10/22/2014 11:25 PM - What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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10/21/2014 4:02 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4792 Rating: (123)	New question published byMicroMan is split to a separate thread with the subject Is there any way to read out the address of a Static variable of an FB? Best regards Min_Moderator

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11/5/2014 2:56 PM	Rate (0)
ViliamV Posts: 3 Rating: (0)	Hello all, I would like to ask you if I understand it well, because it doesnt work to me: pAnySRC.S7Code := 16#10; pAnySRC.DataType := 16#02; pAnySRC.Length := 1; pAnySRC.DBNumber := 1; pAnySRCMemoryArea := 16#84; pAnySRC.ByteAddressMSB := 0; pAnySRC.ByteAddressLSB := 0; pAnyDST.S7Code := 16#10; pAnyDST.DataType := 16#02; pAnyDST.Length := 1; pAnyDST.DBNumber := 3; pAnyDSTMemoryArea := 16#84; pAnyDST.ByteAddressMSB := 0; pAnyDST.ByteAddressLSB := 0; I defined it like here: So, does it mean that I want to copy 1 byte from DB1.DBB0, to DB3.DBB0? I tried everything but probably i dont understand it well. Thank you for your help.
ViliamV Posts: 3 Rating: (0)
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11/5/2014 4:29 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 7/28/2023 Posts: 1525 Rating: (527)	The dissambled any pointer data looks good. You will need to point these at an ANY pointer types (pSRC and pDST) as per the code in post #2. Then you need to use the BLKMOV SFB to perform the move. The code you have shown doesn't actually do anything, it only sets up the ANY pointers ready for the copy. The BLKMOV SFB actually performs the copy:- RetVal := BLKMOV(SRCBLK:=pSRC, DSTBLK:=pDST);
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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11/5/2014 6:34 PM	Rate (0)
ViliamV Posts: 3 Rating: (0)	The rest of code is copied from the previous posts. But when CPU executes the code, no data are copied. So I just wanna know if the definition of pointer is correct. I used the start of the DB (0. byte), because there is no way to make a mistake with addresses. I dont now now where is the problem. Attachment SCL Source.pdf (275 Downloads)
ViliamV Posts: 3 Rating: (0)
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11/6/2014 9:48 AM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 8/24/2023 Posts: 1347 Rating: (228)	Hi, erg := SFC20(srcblk:= ~~pAnySRC~~, dstblk:= ~~pAnyDST~~); you copy the content of the pointer. erg := SFC20(srcblk:=pSRC, dstblk:=pDST); you copy the data area defined n the pointer. Test it. Come back if it worked or not. No worries, I made the same mistake. Cheers
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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11/6/2014 11:04 AM	Rate (0)
ViliamV Posts: 3 Rating: (0)	Hi, thank you so much, it works. But i tried yesterday code from siemens support site and it works also: http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&objId=22109932&load=treecontent&lang=en&siteid=cseus&aktprim=0&objaction=csview&extranet=standard&viewreg=WW You can see, that code is executed in FC, not FB. In FB works: pSRC, pDST : ANY; pAnySRC AT pSRC : pAnyDST AT pDST : RetVal := SFC20(srcblk:= pSRC, dstblk:= pDST); In FC works: pAnySRC: STRUCT // Definition of ANY pointer END_STRUCT; pAnyDST: STRUCT // Definition of ANY pointer END_STRUCT; pSRC AT pAnySRC : ANY; pDST AT pAnyDST : ANY; erg := SFC20(srcblk:= pSRC, dstblk:= pDST); Is it the same or it matters if use ANY in FC or in FB?
ViliamV Posts: 3 Rating: (0)
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