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I
4. A2CCPU
MELSEC·A
4.10.3 Selecting test mode
This Section describes the test modes used to check the link module
hardware and breakage of cables (coaxial cable, fiber-optic cable).
The following five test modes are available.
Switch Setting
Test Mode
Description
Checks the fiber-optic cables or
3
Forward loop test mode
coaxial cables in the data link
system forward loop.
Checks the fiber-optic cables or
4
Reverse loop test mode
coaxial cables in the data link
system reverse loop.
S
Station-to-station test
Checks the lines between the two
(master station)
stations. Set the station assigned
a lower station number as the
Station-to-station test
master station and the one
6
(slave station)
assigned a high station number
as the slave station.
Checks the hardware including
7
Self-Ioopback test
the send/receive circuits in the
transmission system; link module
is checked independently.
4-93

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