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451
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code
Corrective measuresProbable causeContents
16 Command not supported The operand specified in an SV
Read or SV Change command does
not exist in the program.
Check the command and program.
18 Frame length error The maximum frame length of 132
bytes was exceeded.
(If the frame exceeds 280 bytes, the
Reception Overflow Flag will be
turned ON and there won’t be a re-
sponse.)
Check the command and divide it
into multiple frames if necessary.
19 Not executable Items to read not registered for
composite command (QQ).
Execute QQ to register items to
read before attempting batch read.
23 User memory write-protected Pin 1 on C200HX/HG/HE DIP
switch is ON.
Turn OFF pin 1 of the CPU Unit’s
DIP switch.
A3 Aborted due to FCS error in trans-
mit data
An FCS error occurred in the se-
cond or later frame.
Check the FCS calculation method.
If there was influence from noise,
transfer the command again.
A4 Aborted due to format error in
transmit data
The command format did not match
the number of bytes in the second
or later frame.
Check the format and transfer the
command again.
A5 Aborted due to entry number data
error in transmit data
There was a data error in the se-
cond or later frame.
Correct the data and transfer the
command again.
A8 Aborted due to frame length error
in transmit data
The length of the second or later
frame exceeded the 132-byte max.
Keep frames to 132 bytes or fewer.
Errors without Responses A response won’t be received with some errors, regardless of the command.
These errors are listed in the following table.
Error PC operation
Parity overrun or framing error during
command reception
The Communications Error Flag will be turned ON, an error code will
be registered, and receptions will be reset. (The error will be cleared
automatically if communications restart normally.)
A carriage return (CR) isn’t received within
280 bytes.
SR 26407 (RS-232C Port Reception Overflow Flag) will be turned ON.
Communications will return to normal when a normal command is
transmitted.
A command is received that doesn’t have the
@ character at the beginning of the first frame.
Receptions are reset.
Incorrect node number
(Not the local node, hexadecimal, or over 31)
The command is discarded and receptions are reset.
A Write command is divided, but an
intermediate frame or the last frame has only
one or two bytes of data.
FCS error
Host Link Errors Section 9-6