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How to address byte inside a string

Created by: simaticfan79 at: 4/15/2012 4:46 PM (2 Replies)

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4/15/2012 4:46 PM	Rate (0)
simaticfan79 Experienced Member Joined: 1/4/2011 Last visit: 3/9/2023 Posts: 22 Rating: (0)	Dear colleagues, I have this problem... I want to address byte inside a string but I find it imposible with TIA portal V11 SP2. I create standard DB (S7300 compatible) and inside DB I create string. For example: "TESTDB".TSTRING[32] But If I want to address byte inside that string in SCL or LAD editor with absolute addressing for example: DB7.DBB6 it changes immediately into "TESTDB".TSTRING and so It is impossible to address byte inside a string. What I am doing wrong? Thank You!

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4/15/2012 8:54 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (301)	Hello, There are several solutions. Here a less known possibility. In SCL there is a special instruction AT that allows to define the same data but with another format. As in the small example in annex (not tested on a real PLC, and to be adapted to your needs). The FC gets a char(aChar) inside a String (InString)at a given position (POS). The temporary variable TempString and TempStringChar occupy in fact the same area. Allowing to access the data as desired. Attachment CharInString.pdf (356 Downloads)
	Last edited by: jklm at: 4/15/2012 8:58 PM Best regards jklm Suggestion was helpful? Feel free to rate it.
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4/15/2012 10:44 PM	Rate (0)
simaticfan79 Experienced Member Joined: 1/4/2011 Last visit: 3/9/2023 Posts: 22 Rating: (0)	Thank You jklm for your answer! I've learnt something new!

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