Mitsubishi QJ71C24/-R2 User Manual page 272

10 TROUBLESHOOTING
Error code
Error
(Hexa-
decimal)
7F69 Parity error
H
7F6A Buffer full error
H
CD signal control
7F6B
H
error
7F6C Transmission error
H
7F91
H
to
7F96
H
7F98
H
to
7F9A
H
7F9D
H
7F9E
H
7FA0
H
to
7FA3
H
7FA8
H
7FAA
H
System error
to
7FAD
H
7FAF
H
to
7FB2
H
7FB5
H
7FB6
H
7FB8
H
to
7FBC
H
7FC0
H
to
7FC4
H
10 - 21
Error Contents
Data does not match the parity bit setting.
A malfunction occurred in the network because the
power source of the partner station was on or off.
Noise occurs in the network.
When the multidrop was connected, data was
transmitted simultaneously by multiple devices.
OS receive buffer overflowed and receive data was
skipped.
Data was received when CD signal is OFF when
"CD terminal check enabled" was designated.
Data cannot be sent because the line is not
connected.
The OS of the Q series C24 detected some error.
Signal
Corrective action
name
Match the Q series C24 and
external device settings.
Clear the error information
according to the error
information initialization request
(YE/YF).
In addition, when
communicating data with the
non procedure protocol, execute
P/S
the INPUT instruction, and read
and discard the unnecessary
data.
Measure the noise.
When connecting the multidrop,
remove the interlock so that
data will not be transmitted
simultaneously by multiple
devices.
Use DTR and DC control and
perform data communications
so that the buffer does not
become full. (Perform RS CS
control when the modem
SIO
function is used.)
If the Read Request signal was
turned ON, execute read
immediately.
Recheck the CD signal control
of the external device.
CHn
(Send while the CD signal is ON.)
ERR.
Set "no CD terminal checking"
and perform communication.
Transmit data after line
CHn
connection processing on the
interface side that uses the
ERR.
modem function.
— ( 1)
MELSEC-Q
Protocol
Non
Bidire-
MC Proce-
ctional
dure
10 - 21