PLC Programming

The Standard.lib library
RIGHT
Right returns the right, initial string for a given string.
RIGHT (STR, SIZE) means: Take the first SIZE character from the right in the string STR.
Input STR is of type STRING, SIZE is of type INT, the return value of the function is of type STRING.
Example in IL:
LD 'SUSI'
RIGHT 3
ST VarSTRING1 (* Ergebnis ist 'USI' *)
Example in FBD:
Example in ST:
VarSTRING1 := RIGHT ('SUSI',3);
Please Note: String functions are not "thread safe": When using tasks, string functions may only be used in a
single task. If the same function is used in different tasks, there is a danger of overwriting.
MID
Mid returns a partial string from within a string.
Input STR is type STRING, LEN and POS are type INT, the return value of the function is type
STRING.
MID (STR, LEN, POS) means: Retrieve LEN characters from the STR string beginning with the
character at position POS.
Example in IL:
LD
'SUSI'
MID 2,2
ST VarSTRING1 (* Ergebnis ist 'US' *)
Example in FBD:
CONCAT
Example in ST:
VarSTRING1 := MID ('SUSI',2,2);
Please Note: String functions are not "thread safe": When using tasks, string functions may only be used in a
single task. If the same function is used in different tasks, there is a danger of overwriting.
Concatenation (combination) of two strings.
The input variables STR1 and STR2 as well as the return value of the function are type STRING.
Example in IL:
10-40 CoDeSys V2.3