PLC Programming

The Standard.lib library
Example in FBD:
REPLACE
Example in ST:
Var1 := DELETE ('SUXYSI',2,3);
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.
REPLACE replaces a partial string from a larger string with a third string.
The input variable STR1 and STR2 are type STRING, LEN and POS are type INT, the return value of
the function is type STRING.
REPLACE(STR1, STR2, L, P) means: Replace L characters from STR1 with STR2 beginning with the
character in the P position.
Example in IL:
LD
'SUXYSI'
REPLACE 'K', 2,2
ST VarSTRING1 (* Ergebnis ist 'SKYSI' *)
Example in FBD:
Example in ST:
VarSTRING1 := REPLACE ('SUXYSI','K',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.
FIND
FIND searches for a partial string within a string.
The input variable STR1 and STR2 are type STRING, the return value of the function is type STRING.
FIND(STR1, STR2) means: Find the position of the first character where STR2 appears in STR1 for
the first time. If STR2 is not found in STR1, then OUT:=0.
Example in IL:
LD
FIND
'SUXYSI'
'XY'
ST VarINT1 (* Ergebnis ist '3' *)
10-42 CoDeSys V2.3