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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
(b) Cable installation precautions
1) Install the coaxial cables at least 100 mm (3.94 in.) away from other
power cables and control cables.
2) Consider to use double-shielded coaxial cables in locations where
there is excessive noise.
3) To configure a multiplexed remote I/O network for redundant system,
use a double-shielded coaxial cable.
Ground
Mitsubishi Cable · · · 5C-2V-CCY
Double-shielded coaxial cable
Internal
conductor
Insulator
External
conductor
Sheath
Cable close-up
Sheath
External
conductor
(ground)
5C-2V connector plug can be applied to double-shielded coaxial cable.
Connect the plug to the coaxial cable inside the double-shielded
coaxial cable.
Ground the shielded section, external part of the double-shielded
coaxial cable, as shown above.
(c) When connecting a coaxial cable, the following restrictions on the bending
radius must be observed.
Cable type
Allowable bending radius
r [mm (in.)]
Connector
A (mm (in.))
3C – 2V 23 (0.91)
5C – 2V 30 (1.18)
55 (2.17)
A
r
Front of module
(d) Do not pull any of the connected coaxial cables.
This may cause a faulty contact and cable disconnection, or damage the
module.
(e) For coaxial bus type network systems, be sure to connect both end stations
to the terminal register.
(f) Depending on the usage environment, some white oxidation deposits may
be seen on the F type connector. However, oxidation will not occur on the
connection area, so there will be no problems with the function of the unit.
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