1。用sfc14,sfc15和直接读写都行。

2。You require SFC 14 "DPRD_DAT" because you can only read out a maximum of four continuous bytes using load instructions that access the I/Os or the process image input table.

3。You require SFC 15 "DPWR_DAT" because you can only write a maximum of four continuous bytes using the transfer instructions that access the I/Os or the process image input table.