Siemens Simatic 6ES7 157-0AD81-0 A0 Series - 4.2 Connections

Wiring
4-7
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
4.2 Connections
4.2.1 Wiring the DP/PA coupler for stand-alone operation
DP/PA coupler connections
The following figure shows all connections that must be established to and from
the DP/PA coupler for stand-alone operation:
Supply voltage and
PE conductor
24V DC supply voltage for DP/PA coupler
PROFIBUS-DP
master system
PROFIBUS-PA
Figure 4-4 DP/PA coupler connections for stand-alone operation