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Hi Folks,
probably newbie mistake, but i just cannot get some functions from the standard library 3.5.9.0 (system) to work in structured text. THe Function blocks receive the input but dont execute the output, and now i am beginning to think that logic behind these standard library functions is not executing .
Specifically Im trying to use both rising edge and falling edge functions to set latch a helper flag. Even it the edge is only high for 1 scan, i should be able to catch the Q output of the function.
Anyone got any ideas why this standard library function does not appear to be executing? Aside from referencing this standard library in the library manager, is there anything else i have to do to get access to these functions? It worries me that this standard library doesnt have a '+' next to its name. THeres also mention of a 'standard64' library in the placeholder section. I dont know if that is relevant. Any help appreciated.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Thank You, much obliged!! Im coming from C# & python background and there appears to be a couple of subtle differences pertaining mostly to instantiation and the use of a constructor . Ive posted some sample code outlining working functions / function blocks in structured text on the pi. Hopefully it will help some other newbies.
Thanks again!
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi Folks,
probably newbie mistake, but i just cannot get some functions from the standard library 3.5.9.0 (system) to work in structured text. THe Function blocks receive the input but dont execute the output, and now i am beginning to think that logic behind these standard library functions is not executing .
Specifically Im trying to use both rising edge and falling edge functions to set latch a helper flag. Even it the edge is only high for 1 scan, i should be able to catch the Q output of the function.
Anyone got any ideas why this standard library function does not appear to be executing? Aside from referencing this standard library in the library manager, is there anything else i have to do to get access to these functions? It worries me that this standard library doesnt have a '+' next to its name. THeres also mention of a 'standard64' library in the placeholder section. I dont know if that is relevant. Any help appreciated.
Hi,
You need to call the fb instance by:
TestRisingEdge ();
This is the missing part.
BR
Edwin
Thank You, much obliged!! Im coming from C# & python background and there appears to be a couple of subtle differences pertaining mostly to instantiation and the use of a constructor . Ive posted some sample code outlining working functions / function blocks in structured text on the pi. Hopefully it will help some other newbies.
Thanks again!