Siemens SIMATIC NET SCALANCE XR-500 Operating Instructions Manual page 69

Two PS598-1 per device, 1-out-of-2 redundancy
Figure 6-8
Connect the IE switch and the PS598-1 with one cable for 24 VDC and a cable for ground.
As an alternative, you can also mount the two PS598-1 power supply units on the rear of the
IE switch and secure them with screws. In this case, no extra cables are necessary. You will
find detailed information in the section "Assembling (Page 39)". It is also possible to operate
the IE switch even after the failure of one PS598-1. The IE switch detects the failure of a
power source and signals the failure. The PS598-1 units share the applied load automatically
and uniformly.
Three PS598-1 units for two devices - 2-out-of-3 redundancy
Figure 6-9
SCALANCE XR-500
Operating Instructions, 09/2018, A5E03275845-12
Connecting two power supply units to a SCALANCE XR552-12M. SCALANCE XR528-
6M is used analogously.
Connecting three power supply units to a SCALANCE XR552-12M. SCALANCE XR528-
6M is used analogously.
Connecting
6.3 100 to 240 VAC power supply
69