| Type | Function | 
| Description | Determines the length of a string (number of characters in a string). | 
| Notes | 
The function does not support 4-byte Unicode characters in the input string.  The input string is interpreted as a double byte string and returns for each 4-byte character the length 2.The function returns the value 1 for each escape character (e.g., \\, \, \n ...). | 
| Parameters | Input  IN1 
Output
 
| Data type: | ANY_STRING |  
| Description: | Input string. |   OUT 
 
| Data type: | INT |  
| Description: | Length of string IN1. |  | 
| Additional information |  EN/ENO behavior 
The POU is only executed if TRUE  is applied to the EN input. If EN = FALSE, the POU is not executed and ENO = FALSE indicates the inactivity. 
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