Mitsubishi A2USCPU(S1), User Manual

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9 - 5
EMC AND LOW VOLTAGE DIRECTIVES 9.
(2) MELSECNET (II) and MELSECNET/10 modules
(a) Use a double-shielded coaxial cable (MITSUBISHI CABLE INDUSTRIES, LTD.:
5C-2V-CCY) for the MELSECNET modules (such as A1SJ71AR21,
A1SJ71LR21, A1SJ71BR11) which uses coaxial cables. Noise in the range of 30
MHz or higher in radiated noise can be suppressed by the use of double-
shielded coaxial cables. Earth the double-shielded coaxial cable by connecting
its outer shield to the ground.
Refer to (1) for the earthing of the shield.
(b) Ensure to attach a ferrite core to the double-shielded coaxial cable connected to
the MELSECNET module. In addition, position the ferrite core on each cable
near the outlet of the control panel. TDK-make ZCAT3035 ferrite core is
recommended.
(3) Ethernet module
Precautions to be followed when AUI cables, twisted pair cables and coaxial cables
are used are described below.
(a) Ensure to earth also the AUI cables
*1
connected to the 10BASE5 connectors of
the A1SJ71E71-B5. Because the AUI cable is of the shielded type, as shown in
the figure below, partly remove the outer cover of it, and earth the exposed shield
section to the ground on the widest contact surface.
(b) Use shielded twisted pair cables as the twisted pair cables
*1
connected to the
10BASE-T connectors. For the shielded twisted pair cables, strip part of the
outer cover and earth the exposed shield section to the ground on the widest
contact surface as shown below.
Refer to (1) for the earthing of the shield.
*1 Make sure to install a ferrite core for the cable.
As a ferrite core, ZCAT2032 manufactured by TDK is recommended.