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APPX
Appendix 4 EMC and Low Voltage Directives
Others
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Ferrite core
A ferrite core has the effect of reducing radiated noise in the 30MHz to 100MHz band.
It is recommended to attach ferrite cores if shielded cables coming out of the control panel do not provide sufficient shielding
effects.
Note that the ferrite cores must be attached at the position closest to the cable hole inside the control panel. If attached at an
improper position, the ferrite core will not produce any effect.
For Ethernet cables as well as terminals that are connected to the module power supply of the I/O module and the external
power supply, attach a ferrite core 4cm away from the I/O module.
The ferrite core has the effect of reducing externally conducted noise as well.
For an input module and an I/O combined module, attach a ferrite core to the cable of the power supply of the connection
target device.
(Ferrite core used for the tests conducted by Mitsubishi: TOKIN Corporation ESD-SR-250, TDK Corporation ZCAT3035-1330)
Ex.
Ferrite core attachment example
When using the I/O module (waterproof module) with the shielded cables not grounded on the module side, attach a ferrite
core to signal wires to prevent the noise induced to the cables from affecting a load connected to the module.
(Ferrite core used for the tests conducted by Mitsubishi: KITAGAWA INDUSTRIES CO.,LTD. MRFC-13)
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