Mitsubishi Melsec-L Series User Manual page 293

Error code
Error
(Hexa-
decimal)
Error count error,
7E42 protocol setting
H
data write error
7E43 Device error
H
Timer 1 time-out
7E44
H
error
7E46 System error
H
Continuous request
7E47
H
error
7E48
H
to System error
7E4C
H
Error during data
7E4D
H
transmission
7E4E System error
H
Device point count
7E4F
H
error
User frame No.
7E50
H
designation error
Unwritten user
7E51
H
frame error
User frame
7E52
H
overwrite error
User frame access
7E53
H
data error
Modification allowed
7E54
H
error
User frame data
7E55
H
error
7E56 System error
H
15 - 24
Description
• Number of processing points exceeds
the range allowed for the command.
• Protocol setting data were written to the
C24 that does not support the
predefined protocol function.
• A nonexistent device was designated.
• Device that cannot be specified by the
corresponding command was
designated.
• The head device No. is out of range.
• A response message was not returned
within the response monitoring time
(timer 1) monitoring time.
• The OS of the C24 detected some
error.
• The next request was received before a
response message was returned for the
preceding request.
• The OS of the C24 detected some
error.
• Mode switching was executed during
data transmission.
• The OS of the C24 detected some
error.
• Access point count is incorrect.
• A user frame No. outside the range was
designated.
• An unwritten user frame No. was
designated.
• A written frame No. overwrite request
was issued.
• A nonexistent command was
designated in a subcommand.
• Byte count exceeding the number of
bytes that can be requested was
designated.
• Flash ROM Write Enable/Protection
Status is set to Write Enable.
• In the Switch Setting, Setting
Modifications is set to Disable.
• There is an error in the user frame
variable data.
• The OS of the C24 detected some
error.
Signal
Corrective action
name
• Modify the setting of the transmit
message from the external device so
that the request will not exceed the limit
of processing points that are allowed for
one transmission and predetermined for
PRO.
each MC protocol command. Then,
retry communications.
• When using the predefined protocol
function, use a C24 that supports the
function.
• Check and correct the external device
PRO. transmit message and restart data
communications.
• Increase the Response monitoring time
(timer 1).
C/N
• When accessing another station's CPU,
check if the routing parameters match.
⎯
( 1)
• Do not send requests continuously from
the external device.
• Adjust the Response monitoring time
PRO.
(timer 1) to the timeout time set for the
external device.
⎯
( 1)
• Make arrangements between the target
CHn device and CPU module so that mode
ERR.
switching is not executed during data
transmission.
⎯
( 1)
• Check and correct the external device
PRO. transmit message and restart data
communications.
• Check and correct the external device
transmit message and restart data
PRO.
communications.
• Recheck the frame No.
• Write the frame beforehand.
• Change the frame No. and restart data
PRO.
communications.
• Recheck the frame No.
• Change the write destination to an
unwritten frame No.
PRO.
• When overwriting, delete the given No.
beforehand.
• Check and correct the external device
PRO. transmit message and restart data
communications.
• Select Protection for the Flash ROM
Write Enable/Protection Status.
PRO.
• Select Enable for the Setting
Modifications in the Switch Setting.
• Check and correct the external device
PRO. transmit message and restart data
communications.
⎯
( 1)
15 TROUBLESHOOTING
Protocol
Non- Bi-
Pre-
proce- direc-
MC
defined
dural tional
15 - 24