You simply use communications blocks FC
1 and FC 2 for the transfer of consistent data with the CP 342-5.
These blocks always transfer the data consistently (taking into
account the evaluation of the block parameters DONE/NDR.
With the CP 342-5 communications processor you
cannot use the system functions SFC14 "DPRD_DAT" and SFC15
"DPWR_DAT". These system functions are released only for integrated
DP interfaces with the S7-300.
FAQ 855860 has been incorporated into the
present FAQ and deleted as a separate FAQ.