RSLogix5000 (How to Increment String)

Sorry I'm a rookie when it comes to working with strings in RSLogix5000

I have a barcode application where I'm trying to increment a barcode string after each successful test. We use a 3 digit scheme. Can you help me out in how to achieve this ...

OIA -> OIB -> OIC

or

L5A -> L5B -> L5C

I don't have Logix on this machine but i would say one way you could do it is increment the value in the SINT spot for that character up one and it should move to the next letter in the ASCII table. Strings all have a data and length part of their tag. Use the string.data part which is 82 SINTs and just put a ADD +1 statement on the SINT you want to modify.

If the last character will always be at the same position, you can just call it out as the "StringTagName.Data[x]".

65 decimal = "A"
90 decimal = "Z"

Make a Counter that goes from 0 to 25, and add 65 to the Counter.ACC value.

Move that result (which will be from 65 to 90) into the "StringTagName.Data[x]" sub-element of the String.


A more complex versions of that involves finding the length of the string, placing your suffix character 1 place after that, and increasing the .LEN value by one.

You can use a lookup table. Increment the indexer and append to your string. The characters will fit into one SINT array(STRING data type)

[0] = 'A'
[1] = 'B'
[2] = 'C'

Etc.

VSGDover said:

Sorry I'm a rookie when it comes to working with strings in RSLogix5000

I have a barcode application where I'm trying to increment a barcode string after each successful test. We use a 3 digit scheme. Can you help me out in how to achieve this ...

OIA -> OIB -> OIC

or

L5A -> L5B -> L5C

Click to expand...

What happens after OIZ or L5Z is incremented (e.g., OJA, L6A)?

Thank you, yes I figured it out. I just had to get to the .DATA[0], .DATA[1], .DATA[2] levels. Thank you!