Siemens SINUMERIK 840D sl Function Manual page 225

data index. All other data sets of an SPL connection are not evaluated with reference to
connection names.
This MD is not incorporated in the checksum calculation; i.e. it can also be changed without
aligning the checksum.
MD13334 $MN_SAFE_SDP_LADDR: I/O start address
When generating the configuration in SIMATIC STEP7 HW Config, for each SPL connection
a start address must be defined for the I/O area, which is used for the F_SENDDP to exchange
data with the associated F_RECVDP. The start address must be the same for the input and
output data areas.
The user must enter the I/O start address of the SPL connection, defined in the configuration,
in MD $MN_SAFE_SDP_LADDR[0...m].
Rules to define the start addresses and address areas of an SPL connection:
● The start address must be identical in the input
● Slot length: Input data area = 6 bytes, output data area = 12 bytes
● Consistency of the slot in the input
length"
The check is made on the PLC side within the scope of the cyclic F_DP communication by
evaluating the SFC14/SFC15 return values. For an error, Alarm 27354 "F_DP: %1
communication, connection %2 signals SFC%3 error %4" is displayed.
Parameterization of the F-net data transfer
The transfer of the SPL outputs in the F-net data is parameterized using the following NCK
machine data:
● $MN_SAFE_SDP_ASSIGN[0...m]
● $MN_SAFE_SDP_FILTER[0...m]
Figure 8-27
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
8.4 Safety-related CPU-CPU communication (F_DP communication)
F-net data transfer F_SENDDP
Connecting sensors and actuators
and output data areas
and output data areas in both cases over the "complete
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