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CHAPTER 16 TROUBLESHOOTING
16
16.7 Error Code List
16.7.3 Error codes stored in the buffer memory
C018
H
The setting value of the IP address of the connected
device is incorrect.
• Correct the IP address.
C020
H
The data length exceeds the allowable range.
• Correct the data length.
• When the amount of data to be sent exceeds the limit,
divide the data into smaller chunks to send it.
C021
H
An abnormal end response was received for
communications using a fixed buffer.
• Read the response end code from the connection end
code or error log area and perform the required action.
C022
H
• A response could not be received within the response
monitoring timer value.
• The connection with the connected device was closed
while waiting for a response.
• Check the operation of the connected device.
• Correct the response monitoring timer value.
• Check the open status of the connection with the
connected device.
C023
H
• The connection with the connected device has not been
opened.
• The connection with the connected device has been
closed.
• Open the connection with the connected device.
C024
H
When "Predefined protocol" is set in "Fixed Buffer
Communication" setting, communications using a fixed
buffer or a random access buffer are executed.
When "Procedure Exist" or "No Procedure" is set in "Fixed
Buffer Communication" setting, a predefined protocol is
executed.
• Correct the connection number of
BUFSND/BUFRCV/BUFRCVS/ECPRTCL instructions.
• Correct the "Fixed Buffer Communication" setting
(Procedure Exist/No Procedure/Predefined protocol) of
the corresponding connection.
C025
H
There is an error in the usage setting area when starting
the open process by the OPEN instruction or input/output
signals.
• When starting the open by using the OPEN instruction,
correct the usage setting area of the control data.
• When starting the open by input/output signals, correct the
connection usage setting area of the buffer memory.
C026
H
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.
C030
H
A sending error has occurred.
• Because there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the cable is disconnected.
• Perform the self-diagnostics test to check for an error in
the Ethernet module.
C031
H
A sending error has occurred.
• Because there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the cable is disconnected.
• Perform the self-diagnostics test to check for an error in
the Ethernet module.
C032
H
A TCP ULP timeout error has occurred in the TCP/IP
communication. (The connected device does not send an
ACK response.)
• Check the operation of the connected device.
• Correct the TCP ULP timeout value and perform the initial
process again.
• Because there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the cable is disconnected.
C033
H
There is no connected device with the IP address that has
been set.
• Correct the IP address of the connected device and the
Ethernet address.
• Use the default value (FFFFFFFFFFFF
H
) if the connected
device has the ARP function. If it does not have the
function, set the MAC address.
• Check the operation of the connected device.
• Because there may be congestion of packets on the line,
send data after a certain period of time.
• Check if the cable is disconnected.
Error code Error description Action
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