.4
,
P
L
r
L-
r
4.
SElTINGS
AND
PROCEDURES BEFORE
..
,
OPERATION
,
,,
.
4
_.
..L.,
MELSEGA
4.6.2
Self-loopback
test
operations
Choek
itom
PC CPU
mmmunication
check
RS23X
Corn-
munications
check
RS-422
com-
munications
check
After writing data to special
A171C24 reads and vorifiss
data
rogistrr
D8072, tho
it.
If
the data matchos, it is
changed and the procedure
is ropoatod.
If
data does not
match, an
orror
is indicated.
Chocks data wnt from
RS
232C connector. If normal,
A171C24 changes data and
the procedure
is
ropeated.
cated.
An
error is indicated
tf
not normal, an error is indi-
if no cable is connected.
2-CIN
(LED No.
16)
IE:: 19)
1
OFF
(LED
No.
1)
Flashing
2-RD
I
(LED
No.
2)
I I
(LED
No.
19)
2-SI0
Checks data mnt from
RS-
422 connector.
if
normal,
AJ71C24 changes data and
the procedure
is
repeatod.
tf
not normal, an error is indi-
cated.
An
error is indicated
if
no cable is connected.
(LED No. 23)
OFF
(LED No.
10)
Flashing
(LED No. 11)
4-si0
(LED No. 23)
ON
ON
ON
-
T
Information
flow
I
I
Irn
-
Ll7
1
CZ4
B
Rs-232c
AJ71C24
RSu2
.The test continues even
if
an error occurred with a checking item.
4-
19
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