Mitsubishi MELSEC-Q Series User Manual page 37

1
OVERVIEW
(1) Ethernet cable
Use shielded twisted pair cables for connection to the 10BASE-T/100BASE-TX
interface connector of the C Controller module. Strip a part of the outer cover and
earth the exposed shield section to the ground on the widest contact surface as
shown below.
(2) RS-232 cable
For the RS-232 cable running outside from the control panel, always earth the shield
section of the shielded cable as shown below.
Figure 1.2 Shielded twisted pair cable grounding
• Earth the shield of the shielded cable as near the C Controller module as
possible taking care to prevent electromagnetic induction from ungrounded
cables.
• Take appropriate measures to earth the exposed shield section of the shielded
cable to the control panel on an increased contact surface.
A clamp may be used as shown in Figure 1.4.
In this case, however, cover the inner surface of the control panel which comes in
contact with the clamp when painting.
Shield section
Figure 1.3 Part to be exposed
Note) The method of earthing by soldering a wire onto the shield section of the
shielded cable as shown below is not recommended. The high frequency
impedance will increase and the shield will be ineffective.
Figure 1.5 Shield grounding (Incorrect example)
Shielded twisted pair cables
Shield
Masked
Recommended clamp fitting: Mitsubishi AD75CK
Figure 1.4 Shield grounding (Correct example)
Shield cable
Wire
Solderless terminal
Screw
Clamp fitting
Shield cable
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2
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