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3 TROUBLESHOOTING
3.5 List of Error Codes
C024H • Communications using the fixed buffer or
communications using a random access buffer were
executed when communication method is set to the
"Predefined Protocol" connection.
• Predefined protocol was executed when
communication method is set to "Fixed Buffer
(Procedure Exist)" or "Fixed Buffer (No Procedure)"
connection.
• Check that there is no error in the connection number
specification of the dedicated instruction.
• Correct the communication method of the connection
with the external device.
C025H There is an error in the usage setting area when starting
the open processing by the CONOPEN/OPEN instruction
or I/O signals.
• When starting the open by using the CONOPEN/
OPEN instruction, correct the usage setting area of the
control data.
• When starting the open by I/O signals, correct the
connection usage setting area of the buffer memory.
C026H An error has occurred when reading/writing/verifying the
predefined protocol setting data.
• Check that connection cable with the engineering tool
is not disconnected and read/write/verify the
predefined protocol setting data again.
• Do not write data simultaneously when writing protocol
setting data from multiple engineering tools.
C027H Message send of the socket communications has failed. • Check the operation of the external device or switching
hub.
• Since there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the connection cable is disconnected.
• Check that there is no connection failure with the
switching hub.
• Execute the communication status test, and if the test
was completed with an error, take the corrective action.
• Execute the module communication test, and check
that there is no failure in the module.
• Check the IP address specified as the destination.
C028H Message send of the fixed buffer has failed. • Check the operation of the external device or switching
hub.
• Since there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the connection cable is disconnected.
• Check that there is no connection failure with the
switching hub.
• Execute the communication status test, and if the test
was completed with an error, take the corrective action.
• Execute the module communication test, and check
that there is no failure in the module.
• Check the IP address specified as the destination.
C029H • Description of control data is not correct.
• Open instruction was executed through open settings
parameter even though parameters are not set.
• Correct the descriptions of the control data.
• Set the open settings parameters. Execute the OPEN
instruction through control data.
C035H The existence of the external device could not be
checked within the response monitoring timer value.
• Check the operation of the external device.
• Correct the settings in "Timer Settings for Data
Communication" under "Application Settings" of the
Ethernet-equipped module.
• Check if the connection cable is disconnected.
C040H • Not all the data could be received within the response
monitoring timer value.
• Sufficient data for the data length could not be
received.
• The remaining part of the message divided at the TCP/
IP level could not be received within the response
monitoring timer value.
• Correct the data length of the communication data.
• The packets may be crowded in the line, so send the
data again from the external device after a random
time has passed.
C050H When "ASCII" has been selected in the communication
data code setting of the Ethernet-equipped module,
ASCII code data which cannot be converted into binary
code data has been received.
Check if ASCII code data which cannot be converted into
binary code data has been sent from the external device.
C051H • The number of read/write points from/to the device of
SLMP message is out of the allowable range in the
CPU module (in units of words).
• The number of write points for the long counter of
SLMP message is not in two-word units.
Correct the number of read/write points and send the
SLMP message to the Ethernet-equipped module again.
Error
code
Error details and causes Action Detailed information
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