Configuring And Parameterizing The F_Dp Communication - Siemens SINUMERIK 840D sl Function Manual

Connecting sensors and actuators
8.4 Safety-related CPU-CPU communication (F_DP communication)
F-acknowledgment telegram
For an F-net data telegram, which is identified as error-free, the F_RECVDP of the F-CPU2
(receiver) generates an F-acknowledgment telegram and writes this to the output data range
of the F-CPU. The F-acknowledgment telegram has the following structure:
● 2 byte status word
● 2 byte sequence number
● 2 byte CRC
Note
For the F_DP communication, F-net data is only transferred from the F_SENDDP (CPU1:
Sender) to F_RECVDP (CPU2: Receiver). If F-net data also have to be transferred in the
opposite direction, i.e. from CPU2 to CPU1, then an additional F_DP communication
relationship must be configured.
8.4.1

Configuring and parameterizing the F_DP communication

The NCK machine data to parameterize F_DP communication are entered at the HMI. The
NCK-F_DP layer transfers the machine data via the dual port RAM (DPR) to the PLC-F_DP
layer. The NCK and PLC-F_DP layers evaluate the particular NCK machine data and initialize
the parameterized F_SENDDP and F_RECVDP drivers in this machine data for cyclic F_DP
communication.
The machine data listed to parameterize F_DP communication are all taken into account in
checksums (if not explicitly explained), so that if the MDs are accidentally changed, then an
appropriate alarm is output.
The start addresses (logical basis addresses) of the input and output ranges of the F_DP
communication at the I/O bus lines of a SINUMERIK 840D sl on the PLC side are defined when
configuring the hardware using SIMATIC Step7 HW Config.
The user must ensure that the starting addresses - assigned on the STEP 7 side - match the
starting addresses parameterized in the NCK machine data. A check or automatic alignment
is not made.
Parameterizing logical basis addresses in Step7
The parameterization of logical basis addresses for the F_DP communication of two NCUs via
the X136 DP interface as PROFIBUS master-slave coupling is described as an example in
this section.
If a DP/DP or PN/PN coupler is used then the coupling is directly configured by configuring
these devices (see Simatic documentation).
PN/PN coupler
http://support.automation.siemens.com/WW/view/en/26993088/133300
DP/DP coupler
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated