Siemens SIRIUS ACT 3SU1 System Manual page 296

AS-Interface 3SU14
11.13 Wiring examples
AS-i enclosure with two command points with EMERGENCY STOP, wired to the right
Note
EMERGENCY STOP conventionally wired.
Note
Position of EMERGENCY STOP
If the EMERGENCY STOP is mounted at command point B, the wiring must be to the left.
296
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 08/2018, A5E03457306020A/RS-AK/010