Advantech RS-485 user manual Single Point Grounding, Figure F-7 Single point groundinF

Grounding Reference

Above diagram just shows you that the wire impedance will consume the power.

1.5 Single Point Grounding

Single Point Grounding

A D A M	A D A M	A D A M	A D A M	+24V
4 0 1 3	4 0 1 4	4 0 1 7	4 0 2 1
				Power
				Supply
+16V	+18V	+20V	+22V

Those devices will influence each other with swiftly load change.

Figure F-7: Single point groundinF. (1)

•What’s Single Point Grounding?

Maybe you had some displease experiences just like take hot water shower in Winter. When someone turns on another hot water hydrant near the Heater, you’ll be impressed with the cold water!

The bottom diagram of above figure just shows that those devices will influence each other with swiftly load change. For example, normally we turn on all the four hydrants for testinF. When you close the hydrant 3 and hydrant 4, the other two hydrants will get a more flow. In other words, the hydrant can not keep a constant flow rate.

F-8 ADAM-5000