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MELSEC-Q
4 SETTING AND PROCEDURE BEFORE OPERATION
(c) Removing the optical fiber cable
The following are how to remove the optical fiber cable:
Put the covers, which were attached to
the plug before installation, back on both
the plug and jack to store.
Press the fixed sections of the plug in
the
directions of the arrows and pull out
the plug.
Removal
Complete
Turn OFF the power.
Plug
Cover
POINT
Data link operation may be executed even if IN and IN or OUT and OUT are
connected with an optical fiber cable. However, the loopback function, the network
diagnostic function and some of other functions do not operate normally. So, make
sure to connect OUT and IN.
The wiring status can be checked by either of the following methods.
(1) When checking by stopping data link
Conduct a loop test in the network diagnostics of GX Developer. (Refer to
Section 4.10.1.)
(2) When checking without stopping data link
Check the status of SW009C to 9F. (Refer to Section 8.2.9.)
4.8.2 Coaxial bus system
(1) Precautions in connecting
(a) Restrictions on the cable length between the stations
1) When connecting between the network modules, the cable lengths
indicated in the table below should be used according to the number of
stations connected.
A communication error may occur if a cable length other than the
lengths indicated in the table is used.
Number of stations
connected
Station-to-station cable length
2 to 9 stations
10 to 33 stations
Cable type 3C – 2V 5C – 2V 5C – FB 3C – 2V 5C – 2V 5C – FB
0 to 1 m (3.28 ft.)
(cable less than 1m (3.28 ft.) in length cannot be used.)
1 (3.28 ft.) to 5 m (16.41 ft.)
5 (16.41 ft.) to 13 m (42.65 ft.)
13 (42.65 ft.) to 17 m (55.78 ft.)
17 (55.78 ft.) to 25 m (82.03 ft.)
25 (82.03 ft.) to 300 m (984.3 ft.)
300 (984.3 ft.) to 500 m (1640.5 ft.)
: Allowed : Not allowed
2) If there is a possibility of adding more stations to expand the existing
system, the cables should be installed by considering restriction 1)
mentioned above in advance.
3) When using a repeater module (models A6BR10 or A6BR10-DC), use
the station-to-station cable length for "10 to 33" stations, regardless of
the number of stations connected or the number of repeater modules.