4.
SElTINGS AND PROCEDURES BEFORE OPERATION
MELSEGA
1
1
Step
3
Execute the self-loopback test
(1) Turn the PC CPU power supply
ON
or reset the PC CPU.
The test starts automatically when the AJ71C24 READY signal
turns
ON.
The READY signal turns
ON
a few seconds after the
power supply is turned
ON
or the
PC
CPU is reset.
(2) Check sequence
Checks are executed
out
In the following order:
1)
PC CPU communications check
2) RS-232C communications check
3) RS-422 communications check
The checks are then repeated. The checks are completed
within one second. The checks are executed automatically
by the AJ71 C24.
(3)
Check the LED display status, as described
in
Section 4.6.2.
Normal
:
Follow procedure
(4)
to end the test.
Error
:
Correct the error and repeat the self-loopback test
(4) When checks are completed:
1) Turn the power supply
OFF.
2) Disconnect the cables. Connect the cables to link with the
3) Change the setting of the mode setting switch. ("1" to "D")
computers.
POINTI
When the APA(S1) or A3ACPU is used, up to
6
AJ71C24 modules can be
connected to each PC CPU. When other types
of
PC
CPUs are used,
1
or
2 AJ71C24 modules can be loaded to each PC CPU. However, do not
execute
the
self-loopback test with both modules simultaneously (this will
result in a PC CPU communications check error).
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4
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7
J
7
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