Siemens SINUMERIK 808D Commissioning Manual page 24

Connecting
3.3 Connecting according to the default PLC program
Connecting the distributed I/O
Figure 3-5 Connecting the distributed I/O
Connecting the SINAMICS V60 (take X51: axis X for an example)
1)
Figure 3-6 Connecting the SINAMICS V60 (X51: axis X)
1) If necessary, you can also serially connect an emergency stop switch between the 65 enable signal and the 24V signal.
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Commissioning Manual, 01/2015, 6FC5397-4EP10-0BA0
Commissioning Manual