TROUBLESHOOTING
D SERIES CONTROLLER
TROUBLESHOOTING AND COMPONENT REPLACEMENT
1-120 August 9, 2005
Kaaaw sk
ERROR CODE E4021 TCP/IP) Communication Error. CODE=XX
Dst.IP=xx.xx.xx.xx.
A communication error occurred during execution of the UDP_SENDTO/
UDP_RECVFROM/TCP_SEND/TCP_RECV instruction. May be a problem with the
Ethernet line or at the target end.
Check the communication line to the target end node and repair as necessary.
Check for problems at the target end node and repair as necessary.
The sub-error code (CODE=XX) is generated by the TCP/IP package. Refer to the
TCP/IP package manual.
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ERROR CODE E4022 TCP/IP) Message is too long.
Data sent exceeds the allowed size limit using the TCP_SEND/UDP_SENDTO/
UDP_RECVFROM instruction.
Edit the data to within allowed size limit (TCP: 4096 bytes or less, UPD: 1472 bytes or
less).
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ERROR CODE E4023 TCP/IP) Cannot reach the Host.
Failed to connect with the target end node when executing the UDP_SENDTO/
UDP_RECVFROM/TCP_CONNECT instruction. The host of the corresponding IP
address does not exist on the network. Designated port number or IP address may be
wrong. May be a problem with the communication line or at the target end node.
Ensure the port number and the IP address are correct.
Ensure the parameter settings comply with AS Language syntax.
Check the communication line to the target end node and repair as necessary.
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ERROR CODE E4024 TCP/IP) Communication Time Out.
Dst.IP=xx.xx.xx.xx.
Communication time-out occurred during instruction execution. May be a problem with
the Ethernet line or at the target end node.
Check the communication line to the target end node and repair as necessary.
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