Mitsubishi Electric AJ71C24-S6 User Manual page 80

4. SElTlNGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
4.6.2
Self-loopback test operations
Check Items
-
Check Descriptions
PC CPU
:ommunicatior
check
After writing data to special
data register D9072, the
AJ71C24 reads and verifies
it. If the data matches, i t is
changed and the procedure
is repeated. If data does not
match, an error is indicated.
RS-422 com-
munications
check
RS-232C
municatiOnS
check
Checks data sent from RS-
422 connector. if normal,
AJ71C24 changes data and
the procedure is repeated.
If not normal, an error is indi-
cated. An error is indicated
if no cable is connected.
Checks data sent from RS-
232C Connector. If normal,
AJ71C24 changes data and
the procedure is repeated.
If
not normal, an error is indi-
cated. An error is indicated
if no cable is connected.
indicator
Error Indicator LED
LED
1
OFF
1
(LED No. 16)
2-S10
I
OFF
I
(LED No. 19)
I
2-CIN
(LED No. 16)
(LED No. 25)
2-RD
(LED No. 2)
ON
(LED No. 23)
4 - 3 0
ON
(LED No. 10)
Flashing
(LED 4-RD No. I I )
I
I
Information Flow
RS-232C
m
PC CPU RS-422
AJ71C24
'The test continues even if an error occurred with a checking item