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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.5.2 Internal self-loopback test
This test checks the hardware of a standalone network module, including the
send/receive circuit of the transmission system.
(1) System configurations
(a) Optical loop system
Do not connect optical fiber cable to the network module.
Ensure to prevent ambient light from entering the module through
connectors.
(b) Coaxial bus system
Do not connect a cable and connector to the network module.
(c) Twisted bus system
Do not connect a cable and connector to the network module.
(2) Test mode settings
(a) Optical loop system
Set the mode setting switch of the network module to "2" and "6" for
10Mbps and 25Mbps respectively.
(b) Coaxial bus system
Set the mode setting switch of the network module to "2".
(c) Twisted bus system
Set the station number/mode setting switches of " 10" and " 1" to "TEST"
and "8" respectively.
Optical loop system
Coaxial bus system
IN
OUT
Do not allow
ambient light
to enter
Do not connect
anything
Do not connect
anything
Twisted bus system
MODE
2
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