Mitsubishi Electric QJ71E71-100 User Manual page 317

Error
Error description
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
H
input/output 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
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.
• Check the operation of the transceiver and connected device.
* Use a transceiver which can perform the SQE test.
• Because there may be congestion of packets on the line, send
data after a certain period of time.
• Check if the cable is disconnected.
• Check if there is a problem with the connection to the transceiver
or terminating resistor.
• Perform the self-diagnostics test to check for an error in the
Ethernet module.
• Check the operation of the transceiver and connected device.
* Use a transceiver which can perform the SQE test.
• Because there may be congestion of packets on the line, send
data after a certain period of time.
• Check if the cable is disconnected.
• Check if there is a problem with the connection to the transceiver
or terminating resistor.
• Perform the self-diagnostics test to check for an error in the
Ethernet module.
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