Siemens SINUMERIK 840D sl Function Manual page 235

MD13344 $MN_SAFE_RDP_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_RECVDP to exchange
data with the associated F_SENDDP. 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 the MD $MN_SAFE_RDP_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 = 12 bytes, output data area: 6 bytes
● Consistency of the slot in the input
length"
The check on the PLC side is made 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 F-net data in the SPL inputs is parameterized using the following NCK machine
data:
● $MN_SAFE_RDP_ASSIGN[0...m]
● $MN_SAFE_RDP_FILTER[0...m]
Figure 8-30
MD13347 $MN_SAFE_RDP_FILTER F-net data filter
If, on the receiver side, only individual F-data signals of the F-telegram - which are not located
one after the other - are required within the SPL for further processing, then these can be
selected using the F-net data filter.
The F-net data filter is set using machine data $MN_SAFE_RDP_FILTER[0...m].
Example of an NCK parameterization (see the "Example for an NCK parameterization")
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
8.4 Safety-related CPU-CPU communication (F_DP communication)
F-net data transfer F_RECVDP
Connecting sensors and actuators
and output data areas
and output data areas in both cases over the "complete
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