Mitsubishi MELSEC LJ71C24, Руководство пользователя

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15 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Description
Signal
name
Corrective action
MC
Non-
proce-
dural
Bi-
direc-
tional
Pre-
defined
7D18
H
Too few digits error
•
When data are received by the protocol
including a packet that contains a
conversion variable (variable number of
data), the number of digits
corresponding to the variable is
insufficient.
CHn
ERR.
•
Correct the data sent from the device.
•
Check the packet format of the external
device to see if the number of digits is
set correctly.
7D19
H
Invalid number of
digits error
•
When data are received by the protocol
including a packet that contains a
conversion variable (variable number of
data and variable number of digits), the
corresponding data is 0 bytes (0 digits)
or exceeds the maximum number of
digits.
CHn
ERR.
•
Correct the data sent from the device.
•
Check the packet format of the external
device to see if the number of digits is
set correctly.
7D1A
H
Data length error
•
In the data received from the external
device, the Length value does not
match the data length of the conversion
variable(s). CHn
ERR.
•
Check the data sent from the external
device to see if:
1) The Length value is correct or not.
2) Any of the data corresponding to the
conversion variable is missing or
not.
•
Check the packet format of the external
device to see if the conversion variable
is set correctly.
7D1B
H
Value range error
•
When the protocol used for data
reception includes a packet that
contains a conversion variable, a value
of the data for the conversion variable
exceeds the range allowed for the C24.
CHn
ERR.
•
Check the data sent from the external
device.
•
Check the packet format of the external
device to see if the conversion size is
set correctly.
1) If it exceeds the range for word data,
change the conversion size setting
to Double word.
2) If it exceeds the range for double-
word data, change the element to
Non-conversion variable.
7D20
H
Data length setting
error, data quantity
setting error
•
The value set in the data length storage
area or the data quantity storage area is
out of range.
CHn
ERR.
•
Check the maximum allowable data
length, and specify the maximum length
or less in the data length storage area.
•
Check the maximum allowable data
quantity, and specify the maximum
quantity or less in the data quantity
storage area.
7D21
H
Decimal point
position error
•
An out-of-range decimal point position
is set when the number of decimals is
set to Variable point.
•
The number of decimals is larger than
the number of digits for each data.
CHn
ERR.
•
Correct the decimal point position.
•
Check the number of digits setting, and
set the decimal point position so that
the number of decimals is less than the
number of digits.
7E00
H
to
7E05
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7E06
H
Buffer memory
address setting error
•
Transmit/receive buffer memory
addresses are in the special
applications area.
⎯
•
Change the buffer memory addresses so
that they are outside the special
applications area.
7E07
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7E08
H
Currently
inexecutable error
•
The UINI instruction was executed
during execution of the programmable
controller CPU information clear.
⎯
•
Execute the UINI instruction while the
programmable controller CPU
information clear is not executed.
7E09
H
7E0A
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7E40
H
Command error
•
A nonexistent command or
subcommand was designated.
PRO.
•
Check and correct the external device
transmit message and restart data
communications.
7E41
H
Data length error
•
A data length exceeding the number of
points that can communicate during
random read/write was designated. PRO.
•
Check and correct the external device
transmit message and restart data
communications.