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12. TROUBLESHOOTING
MELSEC-A
12.4.3 When the neutral state does not change or data is not received
The AlSJ71C24 LED remains ON indicating (a) the neutral state, or (b) that
communications is disabled (even though a communications request is made
to the AlSJ71C24). The computer cannot receive data.
1
Match me mputerand
A1 SR1 C24 Settings
(see
S x t b n 4.32).
1
Connect ihe signal line
(see Section 4.5).
1
Transmit data from ilta
computer.
Data is not received.
-
Connect me signal line
(see Section 4.5).
I
Send data which
comdies wiih the set
I
I
dedicated ~rotocol.
I
NO
1
1
€hr(a)sethCD%nalso
NO
thatitisahvaysONdun'ngM-
Keep the data terminal
d u r n m m u n i d m s , a
@)
ready signal ON.
set the
B 2 3 X CD
terminalcheck io'd'rsabkd.
SBthFSX?XWterminal
check io'enableb
durhg
M -
dupiexmmun'1ca6ars.
Also,
s e t m e m p l B s o m a t h % -
nalb~msOM3FFushgh
timing mentmed in Sec6on5.4.
Is me result
b
f
End
' I
Consult the nearest
Miubishi
POINTS)
(1) Check point *1
Make sure the A1 SJ71 C24 RD
signal line is connected to the
computer SD signal line.
.
Check the multidrop line
connection.
(2) Check point *2
Make sure the A1 SJ71 C24 SD
signal line is connected to the
computer RD signal line.
Check the multidrop line
connection.
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