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LCD Programming

Created by: Fani.Ing at: 10/14/2014 4:10 PM (9 Replies)

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10/14/2014 4:10 PM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hello, I have one LCD(4X20 char), Data buffer where I can write is only 10bytes. Data pointer is controlling the position of data. I would like to write 10 bytes simultaneously rather than calling each byte seprately. A part of my code is given below. Can some one give better idea how to deal with this issue professionally. IF "Common".System_Ready THEN #Data_Buffer[1] := ' '; #Data_Buffer[2] := ' '; #Data_Buffer[3] := ' '; #Data_Buffer[4] := ' '; #Data_Buffer[5] := 'S'; #Data_Buffer[6] := 'y'; #Data_Buffer[7] := 's'; #Data_Buffer[8] := 't'; #Data_Buffer[9] := 'e'; #Data_Buffer[10]:= 'm'; ELSIF NOT "Common".System_Ready THEN #Data_Buffer[1] := ' '; #Data_Buffer[2] := ' '; #Data_Buffer[3] := 'S'; #Data_Buffer[4] := 'y'; #Data_Buffer[5] := 's'; #Data_Buffer[6] := 't'; #Data_Buffer[7] := 'e'; #Data_Buffer[8] := 'm'; #Data_Buffer[9] := ' '; #Data_Buffer[10]:= 'n'; END_IF; "Radio_Out_7":P := #Display_Mode; "Radio_Out_8":P := #Data_Pointer; "Radio_Out_9":P := #Data_Buffer[1]; "Radio_Out_10":P:= #Data_Buffer[2]; "Radio_Out_11":P:= #Data_Buffer[3]; "Radio_Out_12":P:= #Data_Buffer[4]; "Radio_Out_13":P:= #Data_Buffer[5]; "Radio_Out_14":P:= #Data_Buffer[6]; "Radio_Out_15":P:= #Data_Buffer[7]; "Radio_Out_16":P:= #Data_Buffer[8]; "Radio_Out_17":P:= #Data_Buffer[9]; "Radio_Out_18":P:= #Data_Buffer[10];
Fani.Ing Posts: 77 Rating: (3)	Last edited by: Fani.Ing at: 10/14/2014 4:12 PM Last edited by: Fani.Ing at: 10/14/2014 4:11 PM
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10/14/2014 4:41 PM	Rate (1)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 2/7/2023 Posts: 810 Rating: (118)	Fani.Ing Hello, I have one LCD(4X20 char), Data buffer where I can write is only 10bytes. Data pointer is controlling the position of data. I would like to write 10 bytes simultaneously rather than calling each byte seprately. A part of my code is given below. Can some one give better idea how to deal with this issue professionally. IF "Common".System_Ready THEN #Data_Buffer[1] := ' '; #Data_Buffer[2] := ' '; #Data_Buffer[3] := ' '; #Data_Buffer[4] := ' '; #Data_Buffer[5] := 'S'; #Data_Buffer[6] := 'y'; #Data_Buffer[7] := 's'; #Data_Buffer[8] := 't'; #Data_Buffer[9] := 'e'; #Data_Buffer[10]:= 'm'; ELSIF NOT "Common".System_Ready THEN #Data_Buffer[1] := ' '; #Data_Buffer[2] := ' '; #Data_Buffer[3] := 'S'; #Data_Buffer[4] := 'y'; #Data_Buffer[5] := 's'; #Data_Buffer[6] := 't'; #Data_Buffer[7] := 'e'; #Data_Buffer[8] := 'm'; #Data_Buffer[9] := ' '; #Data_Buffer[10]:= 'n'; END_IF; "Radio_Out_7":P := #Display_Mode; "Radio_Out_8":P := #Data_Pointer; "Radio_Out_9":P := #Data_Buffer[1]; "Radio_Out_10":P:= #Data_Buffer[2]; "Radio_Out_11":P:= #Data_Buffer[3]; "Radio_Out_12":P:= #Data_Buffer[4]; "Radio_Out_13":P:= #Data_Buffer[5]; "Radio_Out_14":P:= #Data_Buffer[6]; "Radio_Out_15":P:= #Data_Buffer[7]; "Radio_Out_16":P:= #Data_Buffer[8]; "Radio_Out_17":P:= #Data_Buffer[9]; "Radio_Out_18":P:= #Data_Buffer[10]; Dear Fani, Which plc are you using? Maybe you could use BLKMOV withan any pointer to write 10bytes at once. Check out: How do access the I/O address area indirectly and what should you watch out for when copying with the SFC20? (optional: How can you construct an ANY pointer in S7-SCL using the AT function?) For S7-1500/1200 check out: How do you copy memory areas in STEP 7 (TIA Portal)? Hope this helps Kind regards, Jens
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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10/15/2014 9:20 AM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hello Jens, Thankyou for valuable suggestions. I am using TIA V12 and IM151-8 CPU.
Fani.Ing Posts: 77 Rating: (3)
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10/15/2014 10:01 AM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hello Jens, I am trying to use the BLKMOV function in SCL but it giving me an error. Here is the code: BLKMOV(SRCBLK:="LCD_Data", DSTBLK=>#Data_Buffer); (the length of data is equal) Error: The function returns a value. I can use this BLKMOV in ladder and there I can flag the return value to any memory area. But in SCL I cann't call the RET_VAL. Any idea what I can do?
Fani.Ing Posts: 77 Rating: (3)
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10/15/2014 10:30 AM	Rate (0)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 2/7/2023 Posts: 810 Rating: (118)	Fani.Ing Hello Jens, I am trying to use the BLKMOV function in SCL but it giving me an error. Here is the code: BLKMOV(SRCBLK:="LCD_Data", DSTBLK=>#Data_Buffer); (the length of data is equal) Error: The function returns a value. I can use this BLKMOV in ladder and there I can flag the return value to any memory area. But in SCL I cann't call the RET_VAL. Any idea what I can do? Dear Fani, you need a return value. To solve your problem you should define an integer named for example "Return_Value" (this may be a temporary tag or static or whatever your choise), then you can use following syntax: Return_Value := BLKMOV(SRCBLK:="LCD_Data", DSTBLK=>#Data_Buffer); Kind regards, Jens
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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10/15/2014 10:42 AM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hello Jens, Thanks again. One more question here. #Return_Value := BLKMOV(SRCBLK:="LCD_Data", DSTBLK=>#Data_Buffer); LCD_Data is a datablock of 10 different arrays and each array is 10 bytes. In the source LCD_Data if I want to read only 10 bytes of data and copy 10 bytes to Data_Buffer how I can specify that in SCL?
Fani.Ing Posts: 77 Rating: (3)
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10/15/2014 11:00 AM	Rate (1)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 2/7/2023 Posts: 810 Rating: (118)	Fani.Ing Hello Jens, Thanks again. One more question here. #Return_Value := BLKMOV(SRCBLK:="LCD_Data", DSTBLK=>#Data_Buffer); LCD_Data is a datablock of 10 different arrays and each array is 10 bytes. In the source LCD_Data if I want to read only 10 bytes of data and copy 10 bytes to Data_Buffer how I can specify that in SCL? Dear Fani, you can use the any pointer for that; How can you construct an ANY pointer in S7-SCL using the AT function? You can specify the length and datatypeof the any pointer to define how many bytes need to be moved. Kind regards, Jens
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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10/15/2014 11:07 AM	Rate (1)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 2/7/2023 Posts: 810 Rating: (118)	Another question;are the Data_Buffer arrayand the arrays inside LCD_Data of the same size and datatype? Else you can just copy them without using pointers. For example: [code] FUNCTION_BLOCK "Block_1" VERSION : 0.1 VAR "DataArray1" : array[0..10] of Int; END_VAR BEGIN "Data_block_2".DataArray := #DataArray1; END_FUNCTION_BLOCK [/code] "Data_block_2".DataArray and#DataArray1 are identical in size and datatype (array[0..10] of int), so we can just use that simple syntax and avoid using pointers (and avoid using standard block access). Kind regards, Jens
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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10/15/2014 11:08 AM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hello Jens, I defined many structs of 10 bytes in the data block and now I can address the struct in the same statement which has solve dteh particular problem. Thanks a lot for such valuable technical help.
Fani.Ing Posts: 77 Rating: (3)
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10/15/2014 11:12 AM	Rate (0)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 2/7/2023 Posts: 810 Rating: (118)	Fani.Ing Hello Jens, I defined many structs of 10 bytes in the data block and now I can address the struct in the same statement which has solve dteh particular problem. Thanks a lot for such valuable technical help. That's the way I would go, avoids all those unnecesary troubles, you can use indicesand you can stick to symbolic addressing as well. Glad to be of help.
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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