Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 277

Error code
The setting value of the IP address of the connected
C018
H
device is incorrect.
C020
The data length exceeds the allowable range.
H
An abnormal end response was received for
C021
H
communications using a fixed buffer.
• A response could not be received within the response
monitoring timer value.
C022
H
• The connection with the connected device was closed
while waiting for a response.
• The connection with the connected device has not been
opened.
C023
H
• The connection with the connected device has been
closed.
When "Predefined protocol" is set in "Fixed Buffer
Communication" setting, communications using a fixed
buffer or a random access buffer are executed.
C024
H
When "Procedure Exist" or "No Procedure" is set in "Fixed
Buffer Communication" setting, a predefined protocol is
executed.
There is an error in the usage setting area when starting
C025
the open process by the OPEN instruction or input/output
H
signals.
An error has occurred when reading/writing/verifying the
C026
H
predefined protocol setting data.
C030
A sending error has occurred.
H
C031
A sending error has occurred.
H
A TCP ULP timeout error has occurred in the TCP/IP
C032
communication. (The connected device does not send an
H
ACK response.)
There is no connected device with the IP address that has
C033
H
been set.
Error description
CHAPTER 16 TROUBLESHOOTING
Action
• Correct the IP address.
• Correct the data length.
• When the amount of data to be sent exceeds the limit,
divide the data into smaller chunks to send it.
• Read the response end code from the connection end
code or error log area and perform the required action.
• Check the operation of the connected device.
• Correct the response monitoring timer value.
• Check the open status of the connection with the
connected device.
• Open the connection with the connected device.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• Correct the IP address of the connected device and the
Ethernet address.
• Use the default value (FFFFFFFFFFFF
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.
16
) if the connected
H
275