Siemens Sinumerik 840D sl Function Manual page 261

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MD13341 $MN_SAFE_RDP_ID
Identifier of the F_DP communication relationship
The identifier must be assigned a freely selectable, unique identifier (DP_DP_ID),
however, this must be unique across all F--CPUs that are connected using F_DP
communication.
MD13342 $MN_SAFE_RDP_NAME
Connection name
An SPL connection can be allocated a meaningful name using this machine data.
The connection name can be freely selected and can be a maximum of 15
characters. The connection name is displayed at the HMI and in the alarm display.
If a connection name is specified, then for Alarms 2735x, the name is displayed.
If a connection name is not specified, then the corresponding identifier is
displayed (DP_DP_ID).
The connection name does not have to be specified in all of the parameterizing
data sets associated with an SPL connection. The connection name that is speci-
fied in the first active parameterizing data set is always used, i.e. the parame-
terizing data set with the lowest machine 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.
MD13344 $MN_SAFE_RDP_LADDR
I/O start address
For each SPL connection, when generating the configuration in SIMATIC STEP 7
HW Config a start address must be defined for the I/O area via which the
F_RECVDP exchanges 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:
S The start address must be identical in the input and output data areas
S Slot length: Input data area = 12 bytes, output data area: 6 bytes
S Consistency of the slot in the input and output data areas in both cases over the
"complete length"
The check on the PLC side is made within the scope of the cyclic F_DP communi-
cation 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.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
Connecting Sensors/Actuators
7-261