Mitsubishi Melsec-L Series User Manual page 296

Error code
Error
(Hexa-
decimal)
Receive header
7F21
H
area error
7F22 Command error
H
MC protocol
7F23
H
message error
7F24 Sum check error
H
7F25 Data length error
H
7F26 Command error
H
7F30 System error
H
Simultaneous
7F31
H
transmission error
7F32 System error
H
7F40
H
Time-out error
7F41
H
7F42
H
7F50
H
to
7F54
H
System error
7F60
H
to
7F66
H
15 - 27
Description
• There is an error in the command
(frame) part.
• An ASCII code that cannot be
converted to binary code was received.
• A nonexistent command, subcommand,
or device was designated.
• The remote password length is wrong.
• There is no data (ETX, CR-LF, etc.)
following the character area, or
designation was incorrect.
• The sum check code calculated does
not match the sum check code
received.
• The horizontal parity code calculated
does not match the horizontal parity
code received.
• The calculated error check code does
not match the received error check
code.
• The length of the received data
exceeds the receive area size.
• Another command was received before
an unlock processing while the remote
password is registered.
• The OS of the C24 detected some
error.
• The C24 and an external device started
transmissions simultaneously.
• The OS of the C24 detected some
error.
• No reception watchdog timer (timer 0)
time-out occurred.
• Response watchdog timer (timer 1)
time-out occurred.
• Transmit watchdog timer (timer 2) time-
out occurred.
• The OS of the C24 detected some
error.
Signal
Corrective action
name
• Check and correct the external device
transmit message and restart data
PRO.
communications.
• Check and correct the external device
transmit message and restart data
PRO.
communications.
• Check and correct the external device
transmit message and restart data
PRO.
communications.
• Check the sum check code of the
external device.
• Check the horizontal parity code
calculated of the external device.
• Check CRC-16 of the external device.
• If the predefined protocol was edited,
check if the following values match the
P/S
packet format of the external device:
1) Processing method or code type of
the error check code
2) Data length
3) Data flow
4) Complement calculation
5) Calculating range
• Correct the "data length" that is
transmitted from the external device.
• Change the "word/byte units" setting to
CHn
ERR. "byte units".
• Increase the receive buffer memory
length designation value.
• Perform the communication after the
CHn
unlock processing is normally
ERR.
completed.
⎯
( 1)
• Perform processing according to the
predefined arrangement with the
external device.
⎯ • When necessary, change the
simultaneous transmission data
valid/invalid designation setting.
(address: 9B /13B )
H H
⎯
( 1)
• Check if data was dropped from the
receive data.
PRO.
• Check if DTR control, etc. interrupted
reception.
• Check the status of the external device,
⎯
and restart data communications, as
required.
• Check if DTR control, etc. interrupted
⎯
transmission.
⎯
( 1)
15 TROUBLESHOOTING
Protocol
Non- Bi-
Pre-
MC proce- direc-
defined
dural tional
15 - 27