When do I need SFC 14 and 15 for profibus communication?

FAQ #100628

It is only possible to read out a maximum of four continuous bytes using load instructions that access the I/O's or the process image input table.


If you are transmitting per example from a SBC Slave a 16 word  output or input. It is not possible to handle this with the process image input table or with the I/O access.


To read or write more than four continuous bytes the system functions SFC14 and SFC15 are available.



xx7 Series / Communication

Last update: 30.05.2015 05:14

First release: 15.11.2006 11:57

Views: 2920

The requested software / document is no longer marketed by Saia-Burgess Controls AG and without technical support. It is an older software version which can be operated only on certain now no longer commercially available products.