Internal Self-Loopback Test - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.5.2 Internal self-loopback test

Optical loop system
IN
OUT
2
MODE
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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.
Coaxial bus system
Do not allow
ambient light
to enter
(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.
Twisted bus system
Do not connect
anything
MELSEC-Q
Do not connect
anything
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