PLC Programming

Appendix D: CoDeSys Libraries
LD
CONCAT
'SUSI'
'WILLI'
ST VarSTRING1 (* Ergebnis ist 'SUSIWILLI' *)
Example in FBD:
Example in ST:
VarSTRING1 := CONCAT ('SUSI','WILLI');
Please Note: The CONCAT function does not work, if nested over more than five levels.
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.
INSERT
INSERT inserts a string into another string at a defined point.
The input variables STR1 and STR2 are type STRING, POS is type INT and the return value of the
function is type STRING.
INSERT(STR1, STR2, POS) means: insert STR2 into STR1 after position POS.
Example in IL:
LD
INSERT
'SUSI'
'XY',2
ST VarSTRING1 (* Ergebnis ist 'SUXYSI' *)
Example in FBD:
Example in ST:
VarSTRING1 := INSERT ('SUSI','XY',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.
DELETE
DELETE removes a partial string from a larger string at a defined position.
The input variable STR is type STRING, LEN and POS are type INT, the return value of the function is
type STRING.
DELETE(S TR, L, P) means: Delete L characters from STR beginning with the character in the P
position.
Example in IL:
LD
DELETE 2,23
'SUXYSI'
ST Var1 (* Ergebnis ist 'SUSI' *)
CoDeSys V2.3 10-41