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4.
SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
(4) When checks are completed:
1) Turn the power supply OFF.
2) Disconnect the cables. Connect the cables to link with the
computers.
3)
Change the setting of the mode setting switch. ("1" to
3 ' ' )
POINT[
Two AlSJ71C24 modules can be loaded to AISCPU. However, do not
execute the self-loopback test with both modules simultaneously (this will
result in a PC CPU communications check error).
4.6.2
Self-loopback test operations
Check Items
PC CPU
communication
check
RS-232C com-
munications
check
Check Descriptions
Normal
indicator
Error Indicator LED
Information Flow
LED
After writing data to special
data register 09072, the
(LED No. 11)
A1 SJ71 C24 reads and
verifies it. If the data
matches, it is changed and
the procedure is repeated. If
data does not match. an
error is indicated.
I
I
I
Checks data sent from RS-
A1 SJ71C24 changes data
232C connector. If normal,
and the procedure is
(LED
No. 14)
error is indicated. An error
is indicated if
no
cable is con-
Flashing
nected.
-
'The test continues even if an error occured with a checking item.
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