Omron CS Series Operation Manual page 259

Results Storage Area Response Codes
Response UNIX error
code message
0081 (None)
0082 (None)
Description
Closed by close command during
socket servicing
Connection with remote node not
achieved for passive TCP open
request
Probable remedy
No action is necessarily called for.
The remote IP address and TCP port number
settings differ from those of the remote socket
(active side).
Section 8-5
233