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MELSEC-Q
4 SETTING AND PROCEDURE BEFORE OPERATION
4.8 Cable Connections
4.8.1 Optical loop system
(1) Precautions when connecting
(a) The type of cables that can be used will vary according to the distance
between stations.
Type
Interstation distance
QJ71LP21,
QJ71LP21-25,
QJ71LP21S-25,
QJ72LP25-25 :
10 Mbps
QJ71LP21-25,
QJ71LP21S-25,
QJ72LP25-25 :
25 Mbps
QJ71LP21G
QJ72LP25G
QJ71LP21GE
QJ72LP25GE
SI optical fiber cable
(Old type: A-2P-
)
L type 500m (1641 ft.) 200m (656 ft.)
Must not be used Must not be used
H type 300m (984 ft.) 100m (328 ft.)
SI optical fiber cable 500m (1641 ft.) 200m (656 ft.)
H-PCF optical fiber cable 1000m (3281 ft.) 400m (1312 ft.)
Broad-band H-PCF optical fiber cable 1000m (3281 ft.) 1000m (3281 ft.)
QSI optical fiber cable 1000m (3281 ft.) 1000m (3281 ft.)
GI-50/125 optical fiber cable Must not be used Must not be used 2000m (6562 ft.) Must not be used
GI-62.5/125 optical fiber cable Must not be used Must not be used Must not be used 2000m (6562 ft.)
(b) When an optical fiber cable is connected, the following restrictions on the
bending radius should be observed.
For details, check the specifications of the cable to be used.
(c) Maintain the bending radius of the optical fiber cable within the allowable
range using a tool for securing the optical fiber cable bending radius.
This tool may be purchased from Mitsubishi Electric System Service, Inc, or
your nearest dealer. Please inquire for more information.
(d) When laying the optical fiber cables, do not touch the fiber cores of the cable
and module connectors, and do not let dust or particles collect on them.
If oil from hands, dust or particles adhere to the cores, the accumulated
transmission loss may cause malfunctions in the data link.
Also, do not remove the cover from the module-side connector until the
optical fiber cable is ready to be installed.
(e) When connecting or disconnecting an optical fiber cable, hold the connector
part of the cable.
(f) Connect the cable and module connectors securely until you hear a "click"
sound.
(g) Be sure to shut off all phases of the external power supply used in the
system before connecting or disconnecting optical fiber cables.