Mitsubishi Electric MELSEC L Series User Manual page 142

(4) Cables used for the modules connected to the head module
When a cable connected to a module such as an I/O module is extended out of the control panel, use a shielded
cable.
If a shielded cable is not used or not grounded properly, the noise immunity will not meet the requirement.
(a) Grounding a shielded cable
● Do not use the tip of a PVC wire soldered onto a shield of the shielded cable for grounding. Doing so will raise the high-
(b) Grounding a twisted pair cable
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• Ground the shield of a shielded cable as close to the module as possible so that the grounded cable will
not be affected by electromagnetic induction from ungrounded cables.
• Ground the exposed shield to a large area on the control panel. A clamp can be used as shown below. In
this case, mask off the inner wall surface of the control panel, which comes in contact with the clamp.
Paint mask
frequency impedance, resulting in loss of the shielding effect.
• Use a shielded twisted pair cable for connection to the 10BASE-T or 100BASE-TX connector. Strip a part
of the jacket of the shielded twisted pair cable as shown below and ground the exposed shield to the
largest area.
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Screw
Clamp fitting
Shielded cable
Shielded cable
Vinyl-coated wire
Solderless terminal
Shielded twisted pair cable
Shield