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String ASCII

Created by: startrek at: 2/18/2010 10:59 AM (7 Replies)

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2/18/2010 10:59 AM	Rate (0)
startrek Posts: 19 Rating: (0)	Hello, I'm working my first application with S7-1200. How can I get the ASCII number of each character in a string variable ? Or else How can I split/covert a string variable to an array of bytes/chars ? Thanks !!!
startrek Posts: 19 Rating: (0)
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2/18/2010 1:28 PM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 10/23/2024 Posts: 1343 Rating: (141)	You can try FieldRead and FieldWrite instructions. Read every char of the string and write it to an array. Build a loop triggered on string length.

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2/19/2010 8:13 AM	Rate (0)
startrek Posts: 19 Rating: (0)	FieldRead and FieldWrite functions does not support input from string variable. As I can see the input has to be an array.
startrek Posts: 19 Rating: (0)
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2/19/2010 9:45 AM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 10/23/2024 Posts: 1343 Rating: (141)	Oh, you're right. YOu need a little workaround to be able to use fieldwrite :) Take the instruction MID to extract a part from the string. 1. At input IN enter your string, input L enter a length of "1" (only 1 char), at input P enter the position of the char by a loop count. At Output enter a string with a length of "1" (Datatype String[1]). 2. Move the String[1] into a variable of Char. 3. Call FieldWrite instruction. At INDEX enter the loop count variable, at VALUE the Char, at MEMBER a array of byte. 4. Increment your loop count Result: Char for Char will be extractet from String and is written to an array. regards

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10/1/2010 6:28 PM	Rate (0)
JTRACKER Posts: 2 Rating: (0)	Not sure what's missing in the explanation, but the move doesn't accept the string data type. "The actual parameter String does not match the data type Char of the formal parmater". Has anyone yet developed procedures or libraries to overcome these ridiculous coding deficiencies?
JTRACKER Posts: 2 Rating: (0)
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10/1/2010 8:19 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 11/19/2024 Posts: 15406 Rating: (2446)	I ran into same problems with STRING->CHAR ARRAY and CHAR ARRAY->STRING. I wrote two functions to handle each case, and a 3rd to do single character->string conversion. They were customized to a max length of 20 characters (STRING[20]), but easily scale up to 254 (max length of a STRING). Attached is a more generalized version of the library along with a way to test it (assuming you have a development PLC available). Attachment Project2.zip (1309 Downloads)
	science guy
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This contribution was helpful to 2 thankful Users JTRACKER TGO

10/1/2010 8:39 PM	Rate (0)
JTRACKER Posts: 2 Rating: (0)	Hey Huggy_d1, I appreciate the quick response to this one. It's been a week of digging for information and getting nowhere. I should have posted when I first had the question ! Thanks
JTRACKER Posts: 2 Rating: (0)
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10/1/2010 9:51 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 11/19/2024 Posts: 15406 Rating: (2446)	Glad I could help. I wish someone had done this before I needed it months ago. I just found out today that much of the stuff I wrote isn't even necessary for my application. I had already converted all my data to string so I could manipulate it more efficiently, and just today I find I didn't even need to work with the CHAR ARRAY in the first place. Now I get to go change my code to work strictly in strings, rip out the guts of all the char array handling and conversion, and smile at the magical improvements. :) Wish I'd seen that little bit of info months ago as it took me a long time to figure out how to do the stuff I attached a couple posts back.
	science guy
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