Siemens Sinumerik 840D sl Function Manual page 250

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
MD13331 $MN_SAFE_SDP_ID
Identifier of the SPL connection
Every SPL connection 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.
MD13332 $MN_SAFE_SDP_NAME
Connection name
An SPL connection can be given a freely selectable connection name with a maxi-
mum of 15 characters using MD $MN_SAFE_SDP_NAME. The connection name
is displayed at the HMI and in the alarm display. If a connection name has been
assigned, then for alarms 2735x, the name is displayed; if a name is not displayed,
then the corresponding DP_DP_ID identifier is displayed.
The connection name does not have to be specified in all of the parameterizing
data sets associated with an SPL connection. The connection name is always
used that is specified in the first active parameterizing data set, 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.
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:
S The start address must be identical in the input and output data areas
S Slot length: Input data area = 6 bytes, output data area = 12 bytes
S Consistency of the slot in the input and output data areas in both cases over the
"complete length"
The check is made on the PLC side 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.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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