Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 71)

MOD30ML and Modcell Maintenance Manual
COMMUNICATIONS
Message Probable Cause Action
Time expired, message
discarded
One of the following messages
has been sent to the instrument:
• WRITE_ATTRIBUTE
• SEQ_WRITE_ATTRIBUTE
• TAKE_CONTROL
• RELEASE_CONTROL
• OVERRIDE_CONTROL
These messages cannot be
processed until the scan task that
they are directed to is idle.
Therefore, when the Write
Message Action attribute in the
MSC block is set for discard, and
the Write Message Timeout
attribute expires, the message is
discarded and this error message
is returned.
Check configured value for the
Write Message Timeout attribute
in the MSC block.
Time expired, message
processed
This is an Extended Modbus write
timeout NAK code. It applies to
the following messages:
• WRITE_ATTRIBUTE
• SEQ_WRITE_ATTRIBUTE
• TAKE_CONTROL
• RELEASE_CONTROL
• OVERRIDE_CONTROL
These messages cannot be
processed until the scan task that
they are directed to is idle.
Therefore, when the Write
Message Action attribute in the
MSC block is set for process, and
the Write Message Timeout
attribute expires, this error
message is returned and the
message will be processed when
it can but it may or may not be
accepted.
Check configured value for the
Write Message Timeout attribute in
the MSC block.
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