Table of Contents
Advertisement
11. TROUBLESHOOTING
MELSEC-A
11.3.5 When communications sometimes fails
f
Communications sometimes fails.
7
Is the computer
multidrop link?
Set mode to '1
'
to '8'.
m
Is the signal cable connection
Change the cable or correct the
RS-422
I
YES
connection.
Link the PC CPU with a computer in
a
1 :l
ratio.
If communications is normal
between every station, the PC CPU
and the computer may be
transmitting data simultaneously to
each other. Interlock them to avoid
simultaneous transmission.
Consult the nearest Mitsubishi
representative.
When the AJ71C24 CD signal in the
full-duplex transmission is
controlled by the computer, either
(a) control the signal so that it is
always ON, or (b) set the CD
terminal check to'disabled'.
Set the RS-232C CD terminal check
to 'enabled' in the half-duplex
communications. Also, set the
computer so that the signal turns
ONIOFF at the timing mentioned in
Section 5.4.
I
Advertisement
Table of Contents
