Use elements of a string array

Hello,

RSLogix5000

I need to take a word from a list of 10 stored in a string array size 10, and copy or move it into a another string which is not an array. I have tried mov and cop but the different data types is an issue anybody have a smart solution,

thanks for any help you can give.

Student For Life.

You want to transfer 1 word? Can you post examples of what you have tried?

See the attached image. First rung is the easy solution. Second rung is only a long walk to do the same thing.

So based on the example above by nhasten I can see how you move an element of your 'strings array' to the 'another string' so you end up with 'long text here' copied to the 'another string' array. That's OK, but my version of the 'strings array' has 10 different words which a user can scroll through on a HMI when they select a word I need to copy that array element (word) to the 'another array'.

Please show the two arrays. As far as we know you have two arrays of strings and you wish to copy from one to the other. If that is not what you are trying to do then we need more information.

LITStudent said:

So based on the example above by nhasten I can see how you move an element of your 'strings array' to the 'another string' so you end up with 'long text here' copied to the 'another string' array. That's OK, but my version of the 'strings array' has 10 different words...

Click to expand...

StringsArray is an array of 10 different strings (datatype is STRING[10]). You can see that:

• First element in the array is StringsArray[0] = 'Element 1'
• Second element in the array is StringsArray[1] = 'Element 2'
• Third element in the array is StringsArray[2] = 'A long text here'
• StringsArray[3] to StringsArray[9] are empty strings

AnotherString and OneString are simple strings (datatype STRING). Remember: a string in Logix controllers is in fact a duple of two elements, an array of SINT (DATA) and a DINT (LEN).

Said that, in the first rung I'm copying the third element of StringsArray into AnotherString. The Lenght parameter in COP instruction is 1 because I want to copy one element (not one character) of the array.

LITStudent said:

... my version of the 'strings array' has 10 different words which a user can scroll through on a HMI when they select a word I need to copy that array element (word) to the 'another array'.

Click to expand...

I suppose you use a List or other visual object to select the word, write an index to a tag, and use that tag to point the element in your array. That's ok. However, I'm a bit confused about the destination. In your first post you said:

LITStudent said:

I need to take a word from a list of 10 stored in a string array size 10, and copy or move it into a another string which is not an array.

Click to expand...

Is the destination a simple string or an array of strings?

So I can see how talking about two different arrays was confusing probably chasing my own tail now!

I have attached the controller tags what I need to do is move any of the selected words from the array of strings: HMI_Words_Select_Array into the simple string: HMI_Word.

Thanks for taking the time to look this over.

In the attached image:

• Pointer is a DINT variable, from 0 to 9.
• Each time ControlBit is True, the COP instruction will copy the pointed element to HMI_word.

Your HMI application has to write the Pointer value each time you select an item of the list. In other words, each item of the list shown on the HMI has an associated value (0=PLC, 1=DESIGN...), and that value is written to Pointer when you make the selection.

Notes:

• You must ensure that Pointer is never lower than zero or greater than 9. The controller will fail if you use an out-of-range index in your array.
• It's up to you how to clear ControlBit. Also you can try removing ControlBit.

Thank you nhatsen for all your help the pointer works a treat...