Mitsubishi A Series - Page 304

11. TROUBLESHOOTING
MELSEC-A
1 1.3.3 When thc neutral drte daes not change 01 data k not recetved
The AJ71C24 LED remains ON indicating (a) the neutral state, or (b) that
communications is disabled (even though a communications request is
made to the AJ71C24). The computer cannot receive data.
change.
A
/!e\ NO
1
Match the computer
and An1 C24 &tinas
-
(see Ssction 4.3.2).
1
Connect the signal line
(see Sdon 4.5).
I
Transmit data from the
computer.
1
Con- the signal line
(aee Section 4.5).
1
Send data which
CO~DI~~S with the set
NO
, 1
Keep the data terminal
resdy signal ON.
1
L
1
*NO with th. wnptor. , ,
b the resuk
YES Consult the nearest
(End)
Mitsubishi
11 -6
'OINTS 1
(1) Check point '1
e Make sure the AJ71C24 RD
signal line is connected to the
computer
SD signal line.
0 Check the multidrop line
connection.
(2) Check point *2
0 Make sure the AJ71C24 SD
signal line is connected to the
computer RD signal line.
e Check the multidrop line
connection.
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