Siemens SIMATIC CPU 410 System Manual page 69

FF Link
The FF Link bus link is a gateway between a PROFIBUS DP master system and a
FOUNDATION Fieldbus H1 segment and thus enables the integration of FF devices in
SIMATIC PCS 7. The two bus systems are uncoupled from each other by the IM 153-2 FF
both physically (galvanically) and with respect to protocol and time.
The FF Link bus link consists of one or two IM 153-2 FF interface modules and an FDC 157
field device coupler or a redundant FDC 157 coupler pair, which are connected to one
another via passive bus connectors or, in the case of the redundant installation, via bus
modules.
The Compact FF Link bus link consists of one or two IM 655-5 FF interface modules.
FF Link
IM 153-2
FDC 157
Compact FF Link
Rule for PROFIBUS DP
A single-channel switched I/O configuration must always be symmetrical.
● This means the fault-tolerant CPU and other DP masters must be installed in the same
slots in both subsystems (for example slot 4 in both subsystems) or
● The DP slaves must be connected to the same DP interface in both subsystems (for
example to the PROFIBUS DP interfaces of both fault-tolerant CPUs).
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
6ES7153-2DA80-0XB0
6ES7157-0AC85-0XA0
6ES7655-5BA00-0AB0
I/O configuration variants
6.5 Using single-channel switched I/O
69