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I am looking for simple examples for using counters in SFC. Is there anyone who can help me
I just tried to introduce counters with structured text but it doesn't work. I can use function blocks but there should be a more simple way. It is very hard to find examples.
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Develop Codesys lessons (simulation with hardware) with PLC's for second year students at applied sciences level, mechanical engineering.
A simple assignment with three pneumatic cylinders who move in a machine-simulating sequence, with some delay (timer) and some repetition (counter). That's all. (cylinders move in and out, and sensors detect start and end positioning)
I am relatively new (just work for about a year with Codesys) and work with SFC, which I understand now more or less.
Can you specify the sentence "do something" ? could that be a SFC transition, for instance cilinder B is 'in' and sensor b0 is active.
And how to reset the counter ?
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I am looking for simple examples for using counters in SFC. Is there anyone who can help me
I just tried to introduce counters with structured text but it doesn't work. I can use function blocks but there should be a more simple way. It is very hard to find examples.
hey,
what is the problem ?
can you tell , what you really want do to ?
Example :
var
counter : DINT;
endvar
IF (xxx = true)
THEN
counter := counter + 1;
END_IF
IF (counter > 3)
THEN
;( do something )
ELSE
;( do another thing )
END_IF
Thank you very much for your reply !
What I want to do:
Develop Codesys lessons (simulation with hardware) with PLC's for second year students at applied sciences level, mechanical engineering.
A simple assignment with three pneumatic cylinders who move in a machine-simulating sequence, with some delay (timer) and some repetition (counter). That's all. (cylinders move in and out, and sensors detect start and end positioning)
I am relatively new (just work for about a year with Codesys) and work with SFC, which I understand now more or less.
Can you specify the sentence "do something" ? could that be a SFC transition, for instance cilinder B is 'in' and sensor b0 is active.
And how to reset the counter ?
look at the small sample i made, maybe it is helpfull...
Although usefull : search in CODESYS Documentation for SFC Flags...
sfc.project [103.84 KiB]