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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.6 Cable Connection
4.6.1 Optical loop system
(1) Precautions for connecting
(a) The types of optical fiber cables that can be used vary depending on the
distance between stations.
Type
Distance between stations
QJ71LP21, QJ71LP21-25,
QJ71LP21S-25: 10Mbps
QJ71LP21-25,
QJ71LP21S-25: 25Mbps QJ71LP21G QJ71LP21GE
SI optical fiber cable
(Old type: A-2P- )
L type 500 m (1641 feet) 200 m (656 feet)
Must not be used Must not be used
H type 300 m (984 feet) 100 m (328 feet)
SI optical fiber cable 500 m (1641 feet) 200 m (656 feet)
H-PCF optical fiber cable 1000 m (3281 feet) 400 m (1312 feet)
Broad-band H-PCF optical fiber cable 1000 m (3281 feet) 1000 m (3281 feet)
QSI optical fiber cable 1000 m (3281 feet) 1000 m (3281 feet)
GI-50/125 optical fiber cable Must not be used Must not be used 2000 m (6562 feet) Must not be used
GI-62.5/125 optical fiber cable Must not be used Must not be used Must not be used 2000 m (6562 feet)
(b) When connecting an optical fiber cable, check the specifications of the
cable for restrictions on the bending radius.
(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.
Contact Mitsubishi Electric System Service, Inc, for the tool.
(d) When laying the optical fiber cables, do not touch the fiber core of the cable
and module connectors, and avoid dust or particles.
If oil from hands, dust, or particles adhere to the cores, the accumulated
transmission may be lost, resulting in malfunction in the data link.
Do not remove the cover from the module-side connector until the optical
fiber cable is 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 it snaps.
(g) Shut off the external power supply for the system in all phases before
connecting or disconnecting optical fiber cables.
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