Mitsubishi Electric MELSEC iQ-R Series Configuration Manual page 178

Cables extended out of the control panel
Use a shielded cable for a cable extended out of the control panel such as an I/O signal line (including a common line) and
cable for communications.
If a shielded cable is not used or not grounded properly, the noise immunity will not meet the requirement.
■ Grounding a shielded cable
• 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.
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-frequency impedance, resulting in loss of the shielding effect.
■ Grounding cables with a cable clamp
Use shielded cables for external wiring and ground the shields of the shielded cables to the control panel with an AD75CK
cable clamp (manufactured by Mitsubishi). Ground the shields within 20 to 30cm from the module.
20 to 30cm
AD75CK
For details on the AD75CK, refer to the following.
 AD75CK-type Cable Clamping Instruction Manual
APPX
176
Appendix 6 EMC and Low Voltage Directives
(1)
(2)
Shielded
cable
PVC wire
Solderless terminal
(1) Paint mask
(2) Clamp