Mitsubishi Melsec-L Series User Manual page 295

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