Advantech ADAM-5510/P31 Manual page 195

Single Point Grounding
+16V
+22V
More cable, but more stable system.
Above diagram shows you that single point grounding system will be
a more stable system. Actually, when you use the thin cable powering
those devices, the end device will get lower power. The thin cable will
consume the energy.
+18V +20V +22
+22V +22V +22
+24 V
Power
Supply
V
+24
Power
Supply