Siemens SIMATIC S7 Configuration And Programming Manual page 63

Section 3.4, Configuring the F I/Os
Safety Note
!
The switch setting on the address switch of the F I/O, in other words, its
PROFIsafe target address must be unique within the network* and station**
(throughout the system). You can assign a maximum of 1022 PROFIsafe target
addresses in a system, in other words, a maximum of 1022 F I/Os can be
addressed over PROFIsafe.
Exception: In different I-slaves, F I/Os can have the same PROFIsafe target
address since they are only addresses within the station, in other words by the
F-CPU in the I-slave.
The following restriction applies only to F-submodules ET 200S or fail-safe DP
standard slaves whose default PROFIsafe addresses cannot be modified in HW
Config:
If you use F-submodules ET 200S or fail-safe DP standard slaves in a PROFIBUS
network, whose PROFIsafe addresses cannot be modified in HW Config, you can
only operate one DP master with F-CPU in this network, otherwise the system-
wide uniqueness of the PROFIsafe addresses cannot be guaranteed.
*
A network consists of one or more subnets. "Throughout the network" means beyond the
boundaries of PROFIBUS subnets.
**
"Station-wide" means a station in HW Config (for example an S7-300 station or an I-slave)
Section 3.7, Configuring safety-related CPU-CPU Communication via
DP/DP-Coupler (Master to Master Communication)
Note
If you intend to pass more than 2 bi-directional or more than 4 unidirectional
communication connections through a DP/DP coupler, then you must use:
• 4 universal modules for each F-CPU per bi-directional communication
connection
• 2 universal modules for each F-CPU per unidirectional communication
connection
In the object properties of the DP/DP coupler, select "Output" and "Input"
individually as I/O type instead of "Input/Output". Enter the values for the output
data area in the universal module with I/O type "Output" and the values for the
input area in the universal module with I/O type "Input".
If you follow the instructions as in the manual, Section 3.2, you can currently
operate a maximum of 2 bi-directional or 4 unidirectional communication
connections over a DP-DP coupler.
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02
63