Siemens Sinumerik 840D sl Function Manual page 263

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The SPL--SGE area is specified in the decimal notation in the format:
$MN_SAFE_RDP_ASSIGN[n] = aaa bbb with
aaa: Area limit 1, SPL--SGE $A_INSE[aaa]
bbb: Area limit 2, SPL--SGE $A_INSE[bbb]
The following conditions should be observed when specifying the area limit:
S all area data is valid: (aaa > bbb), (aaa < bbb), (aaa = bbb)
S |(aaa -- bbb)| ≤ 16
In case of an error, Alarm 27301 "F_DP: MD %1[%2]: SPL coupling incorrect" is
output.
S |(aaa -- bbb)| = y
With y = number of F net data signals selected in the MD F net data filter
$MN_SAFE_RDP_FILTER.
In the case of an error, Alarm 27303 "F_DP: Number of signals in MD %1[%2]
< > MD %3[%4]" is output.
Example for NCK parameterization (see Page 7-260)
The F net data signals, selected in each of the two SPL connections using the F
net data filter, are available at the output of the particular F net data filter as seam-
less bit field (no gaps). The bit field of the 1st SPL connection is transferred in the
SPL--SGE area $A_INSE[1] to $A_INSE[4] and the bit field of the 2nd SPL con-
nection is transferred in the SPL--SGE area $A_INSE[33] to $A_INSE[36], refer to
diagram 7-30 "F net data transfer F_RECVDP.
An SPL input may only be occupied by one SPL connection. When allocated a
multiple number of times, Alarm 27302 "F_DP: Dual allocation MD %1 [%2] --MD
%3 [%4]" is output.
MD13345 $MN_SAFE_RDP_TIMEOUT
Monitoring time
By specifying the monitoring time, the time is specified, within which a new F tele-
gram, designated using the incremental sequence number, must be sent from the
F_SENDDP (sender) to F_RECVDP (receiver).
The monitoring time is set using MD $MN_SAFE_RDP_TIMEOUT[0...m].
Notes and commissioning
When commissioning F_DP communication for the first time, it is recommended
that the monitoring time is initially kept at the default value in order to avoid alarms
caused by the monitoring time being exceeded. After the F_DP communication has
been successfully commissioned, the monitoring time can then be changed to the
required value, e.g. monitoring time ² 5 * F_DP clock cycle of the slower compo-
nent of the SPL connection with F_DP clock cycle =
$MA_SAFE_SRDP_IPO_TIME_RATIO * IPO clock cycle.
© 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
7-263