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