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

Connecting Sensors/Actuators
7.4 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 area of the F--CPU. The F acknowledgment telegram has the following
structure:
S 2 bytes status word
S 2 bytes sequence number
S 2 bytes 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.
7.4.1

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. NCK and PLC--F_DP layer 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 acciden-
tally changed, then an appropriate alarm is output.
The start addresses (logical basis addresses) of the input and output areas 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).
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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