Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
11 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Description
Signal
name
Corrective action
MC
Non
Proce-
dure
Bidire-
ctional Pre-
defined
Error count error
•
Number of requested points exceeds
the range for the command.
•
Check and correct the external device
transmit message and restart data
communications.
7E42
H
Protocol setting data
write error
•
Protocol setting data were written to the
Q series C24 that does not support the
pre-defined protocol communication.
PRO
•
To use the pre-defined protocol
function, use a supported Q series
C24N. (Use the QJ71C24N(-R2/4)
whose first 5 digits of serial No. is
10122 or higher.)
7E43
H
Device error
•
A nonexistent device was designated.
•
Device that cannot be specified by the
corresponding command was
designated.
•
The head device No. is out of range.
PRO
•
Check and correct the external device
transmit message and restart data
communications.
7E44
H
Timer 1 time-out
error
•
A response message was not returned
within the response monitoring time
(timer 1) monitoring time. C/N
•
Make the timer 1 monitoring time
longer.
•
When accessing another station's CPU,
check if the routing parameters match.
7E46
H
System error
•
The OS of the Q series C24 detected
some error.
⎯
( 1)
7E47
H
Continuous request
error
•
The next request was received before a
response message was returned for the
preceding request. PRO
•
Do not issue continuous requests from
the external device.
•
Set the timer 1 monitoring time to the
external device time-out time.
7E48
H
to
7E4C
H
System error
•
The OS of the Q series C24 detected
some error.
⎯
( 1)
7E4D
H
Error during data
transmission
•
Mode switching was executed during
data transmission.
CHn
ERR.
•
Make arrangements between the target
device and programmable controller
CPU so that mode switching is not
executed during data transmission.
7E4E
H
System error
•
The OS of the Q series C24 detected
some error.
⎯
( 1)
7E4F
H
Device point count
error
•
Access point count is incorrect. PRO
•
Check and correct the external device
transmit message and restart data
communications.
7E50
H
User frame No.
designation error
•
A user frame No. outside the range was
designated.
PRO
•
Check and correct the external device
transmit message and restart data
communications.
•
Recheck the frame No..
7E51
H
Unwritten user
frame error
•
An unwritten user frame No. was
designated.
PRO
•
Write the frame beforehand.
•
Change the frame No. and restart data
communications.
•
Recheck the frame No..
7E52
H
User frame
overwrite error
•
A written frame No. overwrite request
was issued.
PRO
•
Change the write destination to an
unwritten frame No.
•
When overwriting, delete the given No.
beforehand.
7E53
H
User frame access
data error
•
A nonexistent command was
designated in a subcommand.
•
Byte count exceeding the number of
bytes that can be requested was
designated.
PRO
•
Check and correct the external device
transmit message and restart data
communications.
7E54
H
Modification allowed
error
•
Flash ROM write allow/prohibit
designation from GX Configurator-SC is
set to OFF.
•
At the switch setting on GX Developer,
modification allowed switch was set to
OFF.
PRO
•
Set to ON at GX Configurator-SC.
•
Set to ON at GX Developer.
7E55
H
User frame data
error
•
There is an error in the user frame
variable data.
PRO
•
Check and correct the external device
transmit message and restart data
communications.
7E56
H
System error
•
The OS of the Q series C24 detected
some error.
⎯
( 1)