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Active components
4.4 Active components for interfacing to PROFIBUS PA
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
91
To set up a DP/PA link in redundant operation (including coupler and PA ring redundancy),
you also require the following:
Bus module BM IM 153 for 2 x IM 157 (6ES7 195-7HD80 0XA06)
Bus module BM DP/PA coupler for 2 DP/PA couplers (6ES7 195 7HG80-0XA0)
1 field splitter AFS for coupler redundancy (6ES7 157-0AF81-0XA0)
1 to 8 field distributors AFD for ring redundancy (6ES7 157-0AF82-0XA0)
4.4.2 DP/PA coupler
Area of application
The DP/PA coupler (stand-alone) is used for small quantity frameworks and low timing
requirements.
When using the DP/PA coupler, the data rate on PROFIBUS DP must be fixed at 45.45
kbps. The configuration limits are determined either by the maximum number of addressable
slaves (field devices) or the maximum cycle time.
When using the DP/PA coupler, the field devices are addressed directly by the
PLC/automation system; the DP/PA coupler is transparent. It is not necessary to configure
the DP/PA coupler.
Figure 4-17 DP/PA coupler
The figure below illustrates the logical integration of the DP/PA couplers in the system.
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