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Ret_val = - 32476 SFC20(BLKMOV)

Created by: cat_man_do at: 7/21/2014 11:04 AM (11 Replies)

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7/21/2014 11:04 AM	Rate (0)
cat_man_do Posts: 11 Rating: (0)	Hello Experts I am trying to copystrings from one DB to another DB with the help of SFC20(BLKMOV). The code went through compiler without an error. But it shows me RET_VAL = - 32476. What does this mean? FUNCTION FC3009:VOID VAR Test1:STRUCT ID :BYTE; S_data_type:BYTE; S_length:BYTE; S_DB_nr : INT; S_speicherbereich:DWORD; S_Byte_ptr_msb:BYTE; S_Byte_ptr_lsb:WORD; END_STRUCT; Test2:STRUCT ID :BYTE; D_data_type:BYTE; D_length:BYTE; D_DB_nr : INT; D_speicherbereich:DWORD; D_Byte_ptr_msb:BYTE; D_Byte_ptr_lsb:WORD; END_STRUCT; pAny_S AT Test1:ANY; pAny_D AT Test2:ANY; erg: INT; i:INT; END_VAR Test1.ID := 16#10; Test1.S_data_type:=16#13;// strings Test1.S_length:=16#02;// 2 Bytes Test1.S_DB_nr:=3000; Test1.S_speicherbereich:=dw#16#84; // DB Test1.S_Byte_ptr_msb:=0; Test1.S_Byte_ptr_lsb:=0; Test2.ID := 16#10; Test2.D_data_type:=16#13; Test2.D_length:=16#02; Test2.D_DB_nr:=4000; Test2.D_speicherbereich:=dw#16#84; Test2.D_Byte_ptr_msb:=0; Test2.D_Byte_ptr_lsb:=0; erg:=SFC20(srcblk:=pAny_S, dstblk:=pAny_D); END_FUNCTION
cat_man_do Posts: 11 Rating: (0)
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7/21/2014 1:11 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 10/21/2024 Posts: 1547 Rating: (537)	-32476 = 8124 Hex. 8124 status code for BLKMOV is given as:- 8x24 Range error when reading a parameter. So you are trying to copy too much data. Looking at your code, you are trying to copy 2 strings (data type = 16#13 & length = 2). Your comment says copy 2 bytes. Your ANY pointer as set up will not copy 2 bytes. The length parameter units are in the data type you specify (not just bytes). If the data type is set to bytes (16#02) and length is set 2 you will copy 2 bytes. If the data type is set to words(16#04) and length is set 2 you will copy 2 words (4 bytes). etc. To fix your issue, you should I believe set the length to 1, as expect that you only want to copy 1 string not 2. Do not worry about specifying the string length (which is what I expect you have tried to do) as this is taken care of by BLKMOV. BLKMOV knows about the data types and will copy the correct amount of data without you having to work out the amount of bytes for it.
	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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7/21/2014 1:37 PM	Rate (0)
cat_man_do Posts: 11 Rating: (0)	Hello smiffy First of all thanks for your response. I did exactly what u suggested, changed the length to 1.But I am still getting same status code-32476. Test1.ID := 16#10; Test1.S_data_type:=16#13; Test1.S_length:=16#01; Test1.S_DB_nr:=3000; Test1.S_speicherbereich:=dw#16#84; Test1.S_Byte_ptr_msb:=0; Test1.S_Byte_ptr_lsb:=0; Test2.ID := 16#10; Test2.D_data_type:=16#13; Test2.D_length:=16#01; Test2.D_DB_nr:=4000; Test2.D_speicherbereich:=dw#16#84; Test2.D_Byte_ptr_msb:=0; Test2.D_Byte_ptr_lsb:=0;
cat_man_do Posts: 11 Rating: (0)
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7/21/2014 2:46 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	cat_man_do wrote: Hello Experts I am trying to copy strings from one DB to another DB with the help of SFC20(BLKMOV). The code went through compiler without an error. But it shows me RET_VAL = - 32476. What does this mean? FUNCTION FC3009:VOID VAR Test1:STRUCT ID :BYTE; S_data_type:BYTE; S_length:BYTE; S_DB_nr : INT; S_speicherbereich:DWORD; S_Byte_ptr_msb:BYTE; S_Byte_ptr_lsb:WORD; END_STRUCT; Test2:STRUCT ID :BYTE; D_data_type:BYTE; D_length:BYTE; D_DB_nr : INT; D_speicherbereich:DWORD; D_Byte_ptr_msb:BYTE; D_Byte_ptr_lsb:WORD; END_STRUCT; pAny_S AT Test1:ANY; pAny_D AT Test2:ANY; erg: INT; i:INT; END_VAR Test1.ID := 16#10; Test1.S_data_type:=16#13;// strings Test1.S_length:=16#02;// 2 Bytes Test1.S_DB_nr:=3000; Test1.S_speicherbereich:=dw#16#84; // DB Test1.S_Byte_ptr_msb:=0; Test1.S_Byte_ptr_lsb:=0; Test2.ID := 16#10; Test2.D_data_type:=16#13; Test2.D_length:=16#02; Test2.D_DB_nr:=4000; Test2.D_speicherbereich:=dw#16#84; Test2.D_Byte_ptr_msb:=0; Test2.D_Byte_ptr_lsb:=0; erg:=SFC20(srcblk:=pAny_S, dstblk:=pAny_D); END_FUNCTION Hello, There are some points to be checked regarding your SCL codes: Parameter "X_length:int;" should be 2 bytes as the difinition of an ANY pointer suggest. Area pointer to show the starting point of area is formed with "TestX.Y_speicherbereich","TestX.Y_Byte_ptr_msb" ,"TestX.Y_Byte_ptr_lsb" and if you want to start from byte#0 and bit#0, I suggest only using "TestX.Y_speicherbereich:=dw#16#84000000;" as it is DWORD as definition.ANY pointer for a DB should not be more that 10 bytes in length. Different CPUs behave differently to SFC20 plus small CPUs may not accept block numbers that are biggers than some limits (mostly small S7-300 CPUs). If you get same error (or different error) with "TestX.Y_data_type:=16#13;" and "TestX.Y_length:=1;" , try to transfer data byte-wise.There is this hint in STEP 7 online help: "If you use variables of the data type STRING for the SRCBLK and DSTBLK parameters, STEP 7 interprets these variables as ARRAY of BYTE ". Cases mentioned with X,Y should be applicable for both TEST1/TEST2 or source and destination as originally has been chosen by the initiator. Please check the points and update. I hope it helps, Hamid Hosseini
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7/21/2014 3:28 PM	Rate (1)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 10/21/2024 Posts: 1547 Rating: (537)	Your structures are incorrect. You have:- ID :BYTE; S_data_type:BYTE; S_length:BYTE; S_DB_nr : INT; S_speicherbereich:DWORD; S_Byte_ptr_msb:BYTE; S_Byte_ptr_lsb:WORD; The structure should be:- ID (1 byte) Data type (1 byte) Length (2 bytes) DB Number (2 bytes) Area ponter (4 bytes) Making a total of 10 bytes. You have used both speicherbereich and Byte_ptr_msb / Byte_ptr_lsb. You have also set speicherbereich incorrectly. You have set it to dw#16#84 which equates to dw#16#00000084. This is nonsense as your ANY pointer is 14 bytes in length and not 10 as it should be. You should use one or the other. If you just want the data into the start of the DB you can just use speicherbereich and set it to DW#16#84000000 and delete the S_Byte_ptr_msb and S_Byte_ptr_lsb elements. If you want to use other addresses in the DB other than 0, then you will need a different structure. Delete the speicherbereich and add these in place of it:- MemoryArea:Byte S_Byte_ptr_msb:BYTE; S_Byte_ptr_lsb:WORD; Then set MemoryArea to B#16#84 and then set S_Byte_ptr_lsb to the byte address (0 = byte 0, 8 = byte 1, 16 = byte 2 etc.). Leave S_Byte_ptr_msb at 0 for now as this only comes into play when you want to access DB addresses greater then 8192 bytes. Basically the area pointer is in the format:- 10000ZZZ 00000YYY YYYYYYYY YYYYYXXX Where ZZZ is the perand area (in your case 4 (2#100) = Global data block). YYY YYYYYYYY YYYYY is the byte address XXX is the bit address (this MUST always be 0 when using BLKMOV as BLKMOV can only move full bytes and byte alligned boundaries). So in your case 2#10000ZZZ = 2#100000100 = 16#84. The 00000YYY YYYYYYYY YYYYYXXX would be your byte address bit shifted left by 3 bit positions. For example if you wanted to access byte 10 it would be dw#2#0000 0000 0000 0000 0000 0000 0000 1010 bit shifted ledt by 3 = dw#2#0000 0000 0000 0000 0000 0000 0101 0000 = 80 (or 16#50). Note that this 10 * 8 as there are 8 bits in a byte. See the following thread for more details on ANY pointers. /tf/WW/en/Posts/50677n
	Last edited by: smiffy at: 7/21/2014 3:30 PM 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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7/21/2014 3:40 PM	Rate (0)
cat_man_do Posts: 11 Rating: (0)	Hi again, I did make some changes as you suggested. But to no avail. I changed my structures as following: Test1.ID := 16#10; Test1.S_data_type:=16#13; Test1.S_length:=16#01; Test1.S_DB_nr:=3000; Test1.S_speicherbereich:=dw#16#84000000; Test2.ID := 16#10; Test2.D_data_type:=16#13; Test2.D_length:=16#01; Test2.D_DB_nr:=4000; Test2.D_speicherbereich:=dw#16#84000000; and the structures as well : Test1:STRUCT ID :BYTE; S_data_type:BYTE; S_length:BYTE; S_DB_nr : INT; S_speicherbereich:DWORD; END_STRUCT; Test2:STRUCT ID :BYTE; D_data_type:BYTE; D_length:BYTE; D_DB_nr : INT; D_speicherbereich:DWORD; END_STRUCT; Is there anything else that I could be doing worng??? best regards PS By the way that was very good explanation about Any Pointer. It was very helpful thanks.
cat_man_do Posts: 11 Rating: (0)	Last edited by: cat_man_do at: 7/21/2014 3:48 PM Last edited by: cat_man_do at: 7/21/2014 3:41 PM
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7/21/2014 3:46 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 10/21/2024 Posts: 1547 Rating: (537)	Provided that the structure members are the correct size (which you say they are), there should not be an issue with those values. Are you DB's defined and contain straing variables at addresses 0 (both DB's). Maybe as Hamid Hosseini suggested earlier the DB numbers are too large for the CPU you are using. Can you try smaller DB numbers say 3 and 4? 30 and 40? I assume that you are still getting the same error?
	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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7/21/2014 3:54 PM	Rate (0)
cat_man_do Posts: 11 Rating: (0)	Yes, I am getting the same error. My DBs are defined and contain string variables at 0.0 I am using CPU 416-2.Could that be the cause of the problem?
cat_man_do Posts: 11 Rating: (0)
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7/21/2014 4:08 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 10/21/2024 Posts: 1547 Rating: (537)	You still have the length member as a byte type in your structure. Length is 2 bytes in size ao needs to be either an INT or a WORD.
	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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This contribution was helpful to 1 thankful Users cat_man_do

7/21/2014 7:23 PM	Rate (0)
cat_man_do Posts: 11 Rating: (0)	Yes, You are absolutely right. It worked after I changed the data type to Int. So one more question : If I now want to move my pointer to the next byte and let it run in the loop till the end of the DB3000. Is the following approach correct? so as you mentioned earlier : speicherbereich :2#10000ZZZ = 2#100000100 = 16#84---> b#16#84 ptr_msb :00000YYY (8 Bits ----> Byte) ptr_lsb :YYYYYYYY YYYYYXXX (16 bits--> word) so i will only use my ptr_lsb (3 bits shifted to left : 8X2=16) for example : In my sourceblock , the next string lies in byte 2 : that means 28=16=>16#10 and so forth. (increment of 16 bits) - In my Destination block, I want to copy it to byte 3 : that means 38=24=>16#18 and so forth (increment of 24 bits) my structures: ID :BYTE; S_data_type:BYTE; S_length:INT; S_DB_nr : INT; S_speicherbereich:BYTE; S_Byte_ptr_msb:BYTE; S_Byte_ptr_lsb:WORD; ID :BYTE; D_data_type:BYTE; D_length:INT; D_DB_nr : INT; D_speicherbereich:BYTE; D_Byte_ptr_msb:BYTE; D_Byte_ptr_lsb:WORD; pAny_S AT Test1:ANY; pAny_D AT Test2:ANY; erg: INT; i:INT; Test1.ID := 16#10; Test1.S_data_type:=16#13;// strings Test1.S_length:=16#01; Test1.S_DB_nr:=3000; Test1.S_speicherbereich:=b#16#84; // DB Test1.S_Byte_ptr_msb:=0; Test1.S_Byte_ptr_lsb:=0; Test2.ID := 16#10; Test2.D_data_type:=16#13; Test2.D_length:=16#01; Test2.D_DB_nr:=4000; Test2.D_speicherbereich:=b#16#84; Test2.D_Byte_ptr_msb:=0; Test2.D_Byte_ptr_lsb:=0; for i = 1 to 10 // DB3000.length=10 erg:=SFC20(srcblk:=pAny_S, dstblk:=pAny_D); Test1.S_Byte_ptr_lsb:=Test1.S_Byte_ptr_lsb + w#16#10; // increment of pointer to 16th Bit Test2.D_Byte_ptr_lsb:=Test2.D_Byte_ptr_lsb + w#16#18;// same as above to 24th Bit End_For; Thank you very much for your helpful effort. Best regards cat_man_do
cat_man_do Posts: 11 Rating: (0)	Last edited by: cat_man_do at: 7/21/2014 7:45 PM
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