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How to clear certain sections of DB

Created by: Greg_Houghton at: 8/23/2011 12:51 AM (3 Replies)

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8/23/2011 12:51 AM	Rate (0)
Greg_Houghton Posts: 2 Rating: (0)	I have implemented the below code which basically copies information from DB80 depending on which origin is selected too DB43.DBX174.0 -> . ------------------------------------------------------------------------------------------------------------- TEMP variables Name Data Type Address Comment SourcePointer Any 0.0 Err_Block_Copy Int 10.0 SFC14_RETVAL Int 12.0 SFC_RETVAL Int 14.0 PCS_ADDRESS Word 16.0 // preset source pointer to // copy 18 bytes from DB 80 to PCS L B#16#10 // Type DB T LB 0 // [AR1,P#0.0] L B#16#2 // Data Typ = Byte T LB 1 // [AR1,P#1.0] L 14 // number of bytes T LW 2 //[AR1,P#2.0] L 80 // DB Number High + Low T LW 4 // [AR1,P#4.0] // calculate start byte L "SS03_PCS_DB".Origin // 0-5 L 20 // * 20 bytes offset *I // = 0, 20, 40,... SLD 3 // shift left L P#DBX 0.0 +D T LD 6 // [AR1,P#6.0] // copy data CALL "BLKMOV" SRCBLK :=#SourcePointer RET_VAL:=#Err_Block_Copy DSTBLK :=P#DB43.DBX174.0 BYTE 14 ------------------------------------------------------------------------------------------------------------- What i want to do is, after a certain expression becomes true I want to clear the section of data in DB80 that i just copied to DB43... Any ideas?
Greg_Houghton Posts: 2 Rating: (0)
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8/23/2011 7:28 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	Greg_Houghton I have implemented the below code which basically copies information from DB80 depending on which origin is selected too DB43.DBX174.0 -> . ------------------------------------------------------------------------------------------------------------- TEMP variables Name Data Type Address Comment SourcePointer Any 0.0 Err_Block_Copy Int 10.0 SFC14_RETVAL Int 12.0 SFC_RETVAL Int 14.0 PCS_ADDRESS Word 16.0 // preset source pointer to // copy 18 bytes from DB 80 to PCS L B#16#10 // Type DB T LB 0 // [AR1,P#0.0] L B#16#2 // Data Typ = Byte T LB 1 // [AR1,P#1.0] L 14 // number of bytes T LW 2 //[AR1,P#2.0] L 80 // DB Number High + Low T LW 4 // [AR1,P#4.0] // calculate start byte L "SS03_PCS_DB".Origin // 0-5 L 20 // * 20 bytes offset I // = 0, 20, 40,... SLD 3 // shift left L P#DBX 0.0 +D T LD 6 // [AR1,P#6.0] // copy data CALL "BLKMOV" SRCBLK :=#SourcePointer RET_VAL:=#Err_Block_Copy DSTBLK :=P#DB43.DBX174.0 BYTE 14 ------------------------------------------------------------------------------------------------------------- What i want to do is, after a certain expression becomes true I want to clear the section of data in DB80 that i just copied to DB43... Any ideas? Hi Greg_Houghton You can check the following function developed to copy a certain amount of bytes from a soure DB (specified starting address )to a destination DB, same amount of byte and arbitary starting point. The block copies a data area from one data block to onother. The source area and the destination area are specified with "data block number", "data word address" and "number of bytes". The FC assembles the required ANY pointer from the provided data and utilizes SFC20. This is part of sample codes developed for Hans berger's "Automating with STEP7 in STL and SCL".The source codes can be downloaded from here: Automating with STEP 7 in STL and SCL* README.TXT PDF Programming Examples "SCL-Book" ZIP Programming Examples "STL-Book" ZIP Also check this thread: Please help me with this FC out parameter with ANY type Best regards Attachment FC47.pdf (338 Downloads)
	Last edited by: hdhosseini at: 8/23/2011 7:37 AM Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users Saruca

8/23/2011 6:27 PM	Rate (0)
Laloesco Posts: 33 Rating: (5)	Hi Greg You can call sfc21 "FILL" this block fills one table with values from another one, so you can use a MW with value 0 and use the original source as destination address.
Laloesco Posts: 33 Rating: (5)
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8/25/2011 2:59 AM	Rate (0)
Greg_Houghton Posts: 2 Rating: (0)	Thanks guys. Works like a charm. Thanks again.
Greg_Houghton Posts: 2 Rating: (0)
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