CODESYS - the IEC 61131-3 automation software

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PostPosted: Thu Apr 21, 2016 9:07 am 

Joined: Mon Nov 01, 2010 4:30 pm
Posts: 52

in Codesys v.2 help there is a warning that string functions are not thread safe and the same function shouldn't be used in different tasks because there is a danger of overwriting.

My question is, does this apply to all string functions - including LEN and FIND, which return INT - or only to the rest (LEFT, CONCAT etc.) that return STRING ? Can I safely use LEN and FIND from different tasks or they may return a wrong number?


BTW is it possible a task switching to occur while a function executes, if there are no tasks triggered by events?

PostPosted: Fri Apr 22, 2016 7:00 pm 
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Joined: Thu Jun 14, 2007 9:49 am
Posts: 978
dont worry to much.
it indeed has to do with interupts etc. However just dont change a string in a interupt.
when doing a for next loop it can be interupted. but if you have no interupts running it is no problem, as a function is completed (or a rung is done, however multilines are not obvious)

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