Mitsubishi MELSEC LJ71C24, User Manual

Page: 295 / 428

15 - 26 15 - 26
15 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Description
Signal
name
Corrective action
MC
Non-
proce-
dural
Bi-
direc-
tional
Pre-
defined
7E6E
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7E6F
H
Modem connection
error
•
Modem is connected to an incorrect
channel.
⎯
•
Correct the setting of the destination
channel to which data or notification is
sent with the modem function.
7E70
H
CPU module error
•
The communication with the CPU
module was not performed normally.
C/N
•
If there is an error in the CPU module,
eliminate the error on the CPU module
side and communicate again.
7E73
H
,
7E81
H
to
7E8E
H
7EC1
H
7EC2
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7EC3
H
Double send
request error
•
A send request was sent again during
processing of the send request.
⎯ •
Provide an interlock for send requests.
7EC4
H
Transmission data
count error
Transmission/
receive buffer
setting error
•
Data exceeding the transmit buffer
memory size was transmitted.
•
Transmit/receive buffer settings are out
of range.
⎯
•
Make the transmission data count
smaller than the transmit buffer size.
•
Increase the transmission buffer
memory length designation value.
•
Designate the first address and size of
transmission/receipt buffer in the free
area range of the user.
7EC5
H
Flash ROM access
error
•
Write to flash ROM was requested
when the setting modifications is set to
disable.
⎯
•
When writing to the flash ROM, set the
switch setting described on the left to
enable and restart the C24.
7EC6
H
Flash ROM access
error
•
There is an error in the Flash ROM
read/write request contents.
⎯
•
Check the read/write request data and
designate the correct data.
7F00
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
•
The next data was received before
processing of the previous data was
completed.
•
Perform handshake between the
external device and C24.
7F01
H
Buffer full error
•
Multiple requests was simultaneously
issued for one channel.
⎯
•
Do not send requests continuously from
the external device.
7F02
H
to
7F06
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
•
While nonprocedural or bidirectional
protocol is used, an ASCII code that
cannot be converted to binary code was
received.
•
Check and correct the external device
transmit message and restart data
communications.
•
While nonprocedural or bidirectional
protocol is used, an odd number of
bytes of data was received during data
communications using ASCII
BIN
conversion.
•
While nonprocedural or bidirectional
protocol is used and when data are
converted between ASCII and binary,
always transmit data in units of even
bytes.
7F20
H
ASCII BIN
conversion error
•
When data are received by a
conversion variable of the predefined
protocol function, the data
corresponding to the conversion
variable cannot be converted to binary
numbers.
•
When data are received by an error
check code (ASCII hexadecimal or
ASCII decimal) of the predefined
protocol function, the data
corresponding to the error check code
cannot be converted to binary numbers.
PRO.
•
If the predefined protocol was edited,
check if the following values match the
packet format of the external device:
1) Conversion variable and sign
character
2) Number of decimals
3) Delimiter
4) Number of digits
5) Code type of error check code
6) Data length