Chapter 12. Diagnostics
GFK-2224Q January 2017 227
Unable to connect to remote device.
Channel Resources in Use. Try the command again; a resource will become available.
“Establish Read/Write/Send Info Report Channel” COMMREQ was received while an Abort
was in progress.
An attempt to establish a TCP connection with a Remote Server has failed. Check the
following:
▪ Make sure the Server is turned on.
▪ Make sure cables are connected.
▪ If using a switch, make sure the switch is turned on.
A COMMREQ was discarded because the application program issued the COMMREQ
before the COMMREQ Status Word for the previous COMMREQ was set.
A protocol error occurred while communicating with the local PLC.
A TCP Timeout occurred while communicating with the Remote PLC.
A protocol error occurred while communicating with the local PLC.
The channel that the application is trying to open is already open.
The channel the application is trying to access is owned by a different protocol.
COMMREQ specified an invalid Modbus function code.
COMMREQ specified an invalid Modbus unit ID.
COMMREQ specified an invalid number of subrequests.
A COMMREQ subrequest specified an invalid record number.
(Redundancy only) COMMREQs commands are not allowed when Redundant IP address is
not active at this Ethernet interface.
Abort in Progress on a Channel
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