Siemens Simatic 6ES7 157-0AD81-0 A0 Series - 3.2 Installing the DP;PA coupler for stand-alone operation

Installation
3-3
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
3.2 Installing the DP/PA coupler for stand-alone operation
Required components
 Rail for the S7 mounting system
 DP/PA coupler
You can find the order numbers for these components in Appendix D.
Installing the DP/PA coupler
Note
If you operate several DP/PA couplers in a rack in stand-alone mode, it is not
permissible to connect the DP/PA couplers via bus connectors or bus modules.
Step Activity
1 Hook the DP/PA coupler onto the S7 rail and swing it downward.
2 Screw the DP/PA coupler on securely.
3 Wire the DP/PA coupler as described in Section 4.2.1.
Removing the DP/PA coupler
To remove the DP/PA coupler, proceed as above but in reverse order.
If the DP/PA coupler is already in operation, switch off the 24V DC power supply
for the DP/PA coupler prior to removal.