Omron CJ - REFERENCE MANUAL 07-2009 Reference Manual page 126

End Codes
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code
18 Frame length error
19 Not executable
20 Could not create I/O table
21 Not executable due to CPU Unit
CPU error (See note.)
23 User memory protected
A3 Aborted due to FCS error in trans-
mission data
A4 Aborted due to format error in
transmission data
A5 Aborted due to entry number data
error in transmission data
A8 Aborted due to frame length error in
transmission data
Error
A command is received with eight bytes or less
from the @ to the delimiter.
Parity, overrun, or framing error during com-
mand reception. (Same even for commands
address to other Units.)
A command is received that does not have the
@ character at the beginning of the first frame.
Incorrect node number (Not a local unit, BCD,
or over 31)
An LF code is received after the delimiter.
104
The maximum frame length of 131
bytes was exceeded.
(If the frame exceeds 280 bytes, the
Reception Overflow Flag will be
turned ON and there will not be a
response.)
The read SV exceeded 9,999, or an
I/O memory batch read was exe-
cuted when items to read were not
registered for composite command,
or access right was not obtained.
Unrecognized Remote I/O Unit, too
many I/O words, or word duplication
used.
The command cannot be executed
because a CPU error has occurred in
the CPU Unit.
The UM is read-protected or write-
protected.
An FCS error occurred in the second
or later frame, or there were two
bytes or less of data in an intermedi-
ate or final frame for multiple writing.
The command format did not match
the number of bytes in the second or
later frame.
There was an entry number data
error in the second or later frame, a
data length error, or data was not set
in hexadecimal.
The length of the second and later
frames exceeded the maximum of
128 bytes.
Note Occurs only for a Serial Communications Unit/Board.
A response will not be received with some errors, regardless of the command.
These errors are listed in the following table.
The initial command (4 bytes) executes the initial processing. Other
commands are discarded.
The Communications Error Flag will be turned ON, an error code will be
registered, and receptions will be reset. (The error will be cleared auto-
matically if communications restart normally.)
The command is discarded.
The command is discarded.
The LF code is discarded.
Probable cause
PLC operation
Section 4-2
Corrective measures
Check the command and divide it
into multiple frames if necessary.
Register items to read before
attempting batch read, or obtain
access right.
Check the Remote I/O System, the
number of I/O words, and the words
used.
Cycle the CPU Unit's power supply.
Clear write-protection by setting pin 1
of the DIP switch on the front of the
CPU Unit to OFF. Alternatively, clear
the CPU Unit's password-protection
using CX-Programmer.
Correct the command data and
transfer the command again.