Siemens SINUMERIK 840D sl Function Manual page 236

Connecting sensors and actuators
8.4 Safety-related CPU-CPU communication (F_DP communication)
From the F-net data signals of the F-telegram, via the F-net data filter of the 1st SPL connection
(sub-slot 1), bits 0 to 3 are selected and via the F-net data filter of the 2nd SPL connection
(sub-slot 2), bits 12 to 15 are selected. The selected F-net data signals are available as
seamless bit field without any gaps (in the example, with length 4) at the output of the particular
F-net data filter.
MD13346 $MN_SAFE_RDP_ASSIGN: SPL assignment
For the SPL assignment, the F-net data signals selected using the F-net data filter are assigned
to the SPL inputs ($A_INSE) as seamless bit field (without any gaps).
The SPL assignment is set using MD $MN_SAFE_SDP_ASSIGN[0...m].
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:
all area data is valid: (aaa > bbb), (aaa < bbb), (aaa = bbb)
●
In case of an error, Alarm 27301 "F_DP: MD %1[%2]: SPL coupling incorrect".
● |(aaa - bbb)| = y
With y = number of F-net data signals selected in the MD F-net data filter
$MN_SAFE_RDP_FILTER.
In case of an error, Alarm 27303 "F_DP: Number of signals in MD %1[%2] < > MD %3[%4]"
is output.
Example of an NCK parameterization (see the "Example for an NCK parameterization")
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 seamless 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 connection in the SPL-SGE area $A_INSE[33]
to $A_INSE[36], refer to diagram "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- telegram,
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 regarding 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
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|(aaa - bbb)| ≤ 16
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated