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Unican sends 512 MIs per scan....How?

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Hi all,


I'm confused on this one and can't find anything in help files.


I have been using Unican fine before in transferring data b/n V130s & 120s, running at 500Kb.  But the data has always amounted to one lot which is less than 16 MIs. I now have to shift more info around and I can't figure out how to do this in one scan.


I quote "A UniCAN application can send up to 32 messages, each containing 16 integer values, totaling 512 MI register values during a single program scan."


If the Unican Send function only lets me do 16 MIs max, how do I send 32 x 16 of them in the extreme example?  Is the statement only referring to the ability to send it to 32 different plcs?


Ideally I want to assemble a single Mixed Data Struct that will end up at about 70MIs and send it out in one hit.  But the only way I can think to send it, based on the info I have found, is to split it up into 5 x Structs at 16MIs max, and then do 5 sequential 16 MI sends on Unican, each one waiting clearance to have it's turn until starting over, and each one offsetting the required amount.


I am obviously missing something here.  Can someone please point me to a help file that explains this concept, or offer their solutions?  Or have I got it right with the sequential sends?





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  • 3 weeks later...

Hi all,


further to this, and following some much appreciated advice from Joe T, you can just put the sends in series in the one scan and it works fine.  I am still investigating how many I can do reliably.  At present I have 3 going ok and will increase this slowly, but perhaps it can run up to the full 32 mentioned without issue.  I have them all set as low priority at present.


Cara, could we please have a bit more literature available about this?  I can find nothing at all for this scenario which can't be unusual.  It would be nice to know the official knowledge/version to save experimentation hassles.





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  • 1 month later...

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