
B-63943EN/02 5.CONNECTION TO CNC PERIPHERALS
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5.5.3 Anti-Noise Measure
Separating signal lines
Ethernet cable wires belong to group C. See descriptions elsewhere
for explanations about how to separate them from wires in group A or
B.
Cable clamp and shield processing
If any cable led into the CNC requires shielding, clamp it as shown
below. The same method is used also to shield Ethernet twisted-pair
cables. The clamp shown in the figure works not only for cable
fixing but also for shield processing. Shield processing is very
important to maintain the stable operation of the system. Do not
forget attach this clamp. See Subsection 3.5.5, "Cable Clamp and
Shield Processing," for details.
5.5.4 Network Installation
Even when the machine satisfies its grounding requirements, noise
from the machine may get on communication lines depending on the
way the machine is installed and its environment, resulting in a
communication error. Separating and isolating the Ethernet
backbone cable and PC from the machine can prevent noise from
getting on the communication lines.
An example of connection is shown below.