
B–64193EN/01
5. CONNECTION TO CNC PERIPHERALS
83
[Large–scale network]
[Small–scale network]
(*1)
PC and backbone cable side
Power supply for the HUB
HUB
Electrical separation by
connection with
10BASE–T/100BASE–TX
Machine system side
STP cable
STP cable
Machine
(*1) (*1) (*1)
PC
(*1)
STP cable
Power supply for the HUB
HUB
Machine Machine
PC and backbone cable side
Electrical separation by
connection with
10BASE–T/100BASE–TX
Machine system side
(*1)
Machine
NOTE
1 Ground the PC and backbone cable separately from the machine system.
If this is impossible because there is only one grounding point, use separate grounding wires
for the PC/backbone cable and the machine system up to the grounding point.
The grounding resistance must not be higher than 100 Ω (class 3 grounding). The grounding
wire must not be thinner than the AC power line conductor, and its cross–sectional area must
not smaller than 5.5 mm
2
.
2 In some cases, the aforementioned isolation/separation method based on 10BASE–T/
100BASE–TX cannot assure normal communication because of influence by noise. In such
worst environments, use optical fiber media to completely isolate the machine from the PC.