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9.1 Requirements for Conformance to EMC Directive
9.1.3 Cables
9
EMC, LOW VOLTAGE, AND MACHINERY DIRECTIVES
(2) MELSECNET/H module
Be sure to use double-shielded coaxial cables (MITSUBISHI CABLE INDUSTRIES,
LTD.: 5C-2V-CCY) for the coaxial cables of MELSECNET/H module. Radiated noise
in the range of 30HMz or higher can be suppressed by using double-shielded coaxial
cables. Ground the double-shielded coaxial cable by connecting its outer shield to the
ground.
Refer to (1) for the shield grounding processing.
(3) Ethernet module
Precautions for using AUI cables, twisted pair cables, and coaxial cables are
described below.
• Be sure to ground the AUI cables
*1
connected to the 10BASE5 connectors. Since
the AUI cable is of the shielded type, ground the exposed shield section of the
cable, where the cable jacket was partly removed as shown in Figure 9.5, on the
widest contact surface.
Refer to (1) for the shield grounding processing.
* 1 : Make sure to install a ferrite core for the cable.
The ZCAT2032 ferrite core manufactured by TDK is recommended.
• Use shielded twisted pair cables for the twisted pair cables connected to the
10BASE-T/100BASE-TX connectors. Ground the exposed shield section of the
shielded twisted pair cable, where the cable jacket was partly removed as shown
in Figure 9.6, on the widest contact surface.
Refer to (1) for the shield grounding processing.
Figure 9.4 Double-shielded coaxial cable grounding
Figure 9.5 AUI cable grounding
Figure 9.6 Shielded twisted pair cable grounding
Earth here
Shield
AUI cable
Shield
Shielded twisted pair cable
Shield