String functions either act on or return strings.
These IEC 61131-3 standard string functions are supported:
| Function | Explanation |
|---|---|
| LEN | Return the length of a string. |
| LEFT | Return the left part of a string. |
| RIGHT | Return the right part of a string. |
| MID | Return the center part of a string. |
| CONCAT | Add together (concatenate) two or more strings. |
| INSERT | Insert one string into another string. |
| DELETE | Delete part of a string. |
| REPLACE | Replaces part of one string with another string. |
| FIND | Finds the location of one string within another. |
IEC 61131-3 Second Edition: Table 29.
IEC 61131-3 Third Edition: Table 34.
These functions that extend the IEC 61131-3 standard are also supported:
| Function | Explanation |
|---|---|
| CODE_POINT_AT | Returns the Unicode code point at a position of a string. |
| GET_ELEMENT | Return an element of a string. |
| LOWER | Return a string converted to lower case characters. |
| TRIM | Removes whitespace characters from a string. |
| UPPER | Return a string converted to upper case characters. |
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