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Elegant way of combining two specific BYTEs two an INT in SCL?

Created by: The Takstein at: 9/18/2013 6:20 PM (6 Replies)

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9/18/2013 6:20 PM	Rate (0)
The Takstein Regular Member Joined: 8/11/2011 Last visit: 9/2/2022 Posts: 5 Rating: (0)	Hi all! Been picking my brains of some elegant way of combining two BYTEs to an INT, anybody got an idea? I have two BYTES ( a low byte and high byte) that i receive from the DP bus. These I want to combine in SCL. BYTE_TO_INT would only work for one of the bytes. I'm sure i can work around it but it would be a bit messy. Hope anybody has any ideas about this! regards, Takstein

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9/18/2013 7:43 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/9/2023 Posts: 13994 Rating: (2282)	The Takstein Hi all! Been picking my brains of some elegant way of combining two BYTEs to an INT, anybody got an idea? I have two BYTES ( a low byte and high byte) that i receive from the DP bus. These I want to combine in SCL. BYTE_TO_INT would only work for one of the bytes. I'm sure i can work around it but it would be a bit messy. Hope anybody has any ideas about this! regards, Takstein Oneway I can think of is using an SCL FB to join the two bytes. FUNCTION_BLOCK "BytesToWord" { S7_Optimized_Access := 'FALSE' } VERSION : 0.1 VAR_INPUT "hiByte" : Byte; "loByte" : Byte; END_VAR VAR_OUTPUT "WordOut" : Word; "b_s" AT "WordOut" : Struct "hiByte" : Byte; "loByte" : Byte; END_STRUCT; END_VAR BEGIN #b_s.hiByte := #hiByte; #b_s.loByte := #loByte; END_FUNCTION_BLOCK That said, the much easier way is to simply assign the bytes to the integer tag directly. Let's say byte 1 => b0, and byte 2 => b1 (hi and lo bytes respectively), and your integer is int1. int1.b0 := b0; int1.b1 := b1; Now int1's bytes are assigned the values. This can be done in ladder with two MOVE instructions.
	science guy
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This contribution was helpful to 2 thankful Users 51N9Ul4R17y TomInOxford

9/19/2013 10:31 AM	Rate (1)
CezarSuteu Advanced Member Joined: 6/29/2011 Last visit: 10/4/2023 Posts: 42 Rating: (1)	Dear Takstein, You can do it in one line: [code]#INT_Var:=WORD_TO_INT(SHL(IN:=BYTE_TO_WORD(#HighByte), N:=8) OR #LowByte);[/code] However maybe if you need to read integers from the DP bus you can do it directly: [code]#INT_Var:="Tag_Input_Word";[/code] where Tag_Input_Word is defined as %IWx in a PLC tag table. Regards, Cezar

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This contribution was helpful to 4 thankful Users 0_Einstein int3rnal EstebanTP AutoGen_1597227

9/19/2013 12:49 PM	Rate (0)
The Takstein Regular Member Joined: 8/11/2011 Last visit: 9/2/2022 Posts: 5 Rating: (0)	Thanks! this worked!

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9/19/2013 12:50 PM	Rate (0)
The Takstein Regular Member Joined: 8/11/2011 Last visit: 9/2/2022 Posts: 5 Rating: (0)	CezarSuteu Dear Takstein, You can do it in one line: #INT_Var:=WORD_TO_INT(SHL(IN:=BYTE_TO_WORD(#HighByte), N:=8) OR #LowByte); However maybe if you need to read integers from the DP bus you can do it directly: #INT_Var:="Tag_Input_Word"; where Tag_Input_Word is defined as %IWx in a PLC tag table. Regards, Cezar This seemed like the most elegant way indeed! But i managed to get the first option running this morning. Thanks alot anyways!

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9/19/2013 9:38 PM	Rate (1)
Dec Gold Member Joined: 5/19/2006 Last visit: 11/29/2023 Posts: 548 Rating: (107)	Or almost the same [code] #Result := BYTE_TO_INT(#Hi_Byte)*256 + BYTE_TO_INT(#Lo_Byte); [/code]

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9/14/2017 8:50 AM	Rate (0)
Jen_Moderator Moderator Joined: 6/19/2017 Last visit: 12/7/2023 Posts: 7572 Rating: (156)	New question published by nomolina is split to a separate thread with the subject how to do the concatenation and then convert it to display on screen.. Best regards Jen_Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards Jen_Moderator
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