Mitsubishi MELSEC-A Series Reference Manual page 232

8. PROCEDURES TO OPERATION
(3)
(4)
(b) If cables are not connected between F-RD on the master station and F-SD on
the final station, and between R-SD on the master station and R-RD on the final
station, the data link is established in the loopback mode. Therefore, in case of
an error, data link between the faulty station and the final station is disabled.
Optical fiber cable wiring
(a) When wiring optical fiber cables, do not touch the optical fiber cores of the plugs
or jacks and protect them from dust and dirt.
Attached dirt, dust, or oil may cause increase in transmission loss, resulting in
data link fault.
In addition, do not remove the connector cover before cable connection.
When storing the optical fiber cable, attach the connector cover to protect the
connector from dust and dirt.
(b) When connecting/disconnecting an optical fiber cable, be sure to shut off all
phases of the external power supply used by the system.
Coaxial cable wiring
(a) Keep a distance of 100 mm (3.94inch) or more between coaxial cables and other
power and control cables.
Grounding FG of the power supply module of the base unit, where the link
module is mounted, is effective for preventing noise.
(b) When connecting/disconnecting a coaxial cable, be sure to shut off all phases of
the external power supply used by the system.
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