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AM3359 ICE slave interface buffer size

Uladzimir
Intellectual 470 points

Hello,

Is it possible to change a Input/Output buffer size in the slave ethercat simple demo example? It seems to be possible by changing PD_INPUT_SIZE and PD_OUTPUT_SIZE defs in tiescutils.c, isn't it? Then, could you explain, please, how to change a buffer size in TwinCAT? TIESC-001 box defines only one 32 variable in RxPDO/TxPDO. 

  • 0
    TI__Guru 50851 points

    Hi,


    You need to have access of Slave Stack Code (Beckhoff owned) sources to customize EtherCAT application. This is available freely to ETG members.

    http://www.ethercat.org/en/products/54FA3235E29643BC805BDD807DF199DE.htm 

    Stack documentation is public, http://download.beckhoff.com/download/Document/EtherCAT/Development_products/AN_ET9300_V1i6.pdf 

  • 0 in reply to PratheeshGangadhar
    Intellectual 470 points

    Thank you for a reply.

    Is it necessary? Can we change a buffer size by changing PD_INPUT_SIZE and PD_OUTPUT_SIZE defs? Here I changed it from 4 to 32 (8 int’s), and it seems, that memory was allocated properly.  

    Then, I changed TIEtherCATLib.xml to increase Tx/RxPDO size. It seems, buffer size was changed too. A connection runs well, without errors and a red led blinking, but I can change only the first 4 bytes (I named it LED 1), as in demo example, the rest stays unmodified.

    I suppose, maybe there is no necessity in SSC for a such change, because it seems, that a mechanism of changing buffer size was provided in the demo example. Otherwise, for what a function Ecat_Open has arguments, that could be changed? Could you comment that, please?