CTI 2572-B / 2500C-2572-B Installation and Operation Manual 76
The time to process the requested
command exceeded the Command
Timeout value. Command processing has
been halted.
Note that the timeout value may have
been explicitly set in the Command Block
or the default may have been used
(timeout = 0).
If you are using UDP, your first attempt to
send a message to a newly referenced node
may time out while the 2572-B is performing
address resolution. Retry the command.
In some circumstances, you may occasionally
get a timeout error, especially with heavy
local network traffic or slow remote data
links. In these circumstances, your logic
should retry the command.
This error may indicate a bad connection
(faulty cable, loose connector, etc.). Check all
cabling carefully.
If the error persists and you have explicitly
set the timeout value, it is possible that you
have set the timeout value too small. Try
increasing the value or using the default
value.
If you are using multicast, ensure that you
are using the Unacknowledged Write
command not one of the other Word
The protocol manager received a new
command prior to the completing the
previous command.
This error can also be produced by
simultaneously triggering two command slots
which reference the same command block.
If more than one command slot is used, make
sure that they reference different command
blocks and that the command blocks that
they reference have different connection
The 2572-B was unable to read the
requested V memory.
If this occurs on a WRITE REMOTE
command block, it indicates that the 2572-
B could not obtain the data from the local
PLC V memory.
If this occurs on a READ REMOTE
command block, it indicates that the
memory in the remote device could not be
When this error occurs, it is usually due to an
invalid memory address specification in the
command block. Check the value for Source
in Offset 3 and make corrections if necessary.
When this error is returned in response to a
READ REMOTE command block, it is also
possible that there is a problem in the
remote PLC which prevents the 2572-B from
reading V memory. Retry the command. If
the problem persists, check the remote
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