You specify the configuration of the following in the object properties dialog of the
I-slave:
to send to the DP master, a local address (I-slave) and a partner address
(DP master)
•
• to receive from the DP master, a local address (I-slave) and a partner address
(DP master)
You assign the configured addresses to the LADDR parameter of the
corresponding F application blocks F_SENDDP and F_RCVDP in the safety
programs (see Section 1.2.6 and manual, Section 5.4).
Address Areas
Each of the local partner addresses represents a start address of an address area
of input and output data. After configuring the local and partner addresses, the
address areas are automatically assigned. The assigned address areas for a send
and a receive connection are shown in the following table:
Communication
Connection
Assigned Address Area on the F-CPU of the ...
I-slave: 12 bytes of output and 6 bytes of input data Send: I-slave to DP
master
DP master: 12 bytes of input and 6 bytes of output data
I-slave: 12 bytes of input and 6 bytes of output data Receive: I-slave from
DP master
DP master: 12 bytes of output and 6 bytes of input data
Note
We recommend that you use addresses outside the process image as the local
and partner addresses, since the process image should be reserved for the
address areas of modules. When configuring the address areas, the next free
address outside the process image is therefore proposed.
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
14 A5E00169432-02
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