User`s manual

Chapter 6 145
Advanced Operations
Status Reporting
Error Message Queue Group
The Error Message Queue Group is an implementation of the status
queue model described in “Status Queue Model” on page 130. The
Error Message Queue queue type is a first-in, first-out (FIFO) queue
that holds up to 20 messages. The Error Message Queue Group includes
a FIFO queue but no Message Available (MAV) Summary Message.
Refer to the “Status Reporting Structure Overview” on page 121 for an
overview of status queue operation. Figure 6-9 shows the structure of
the Error Message Queue Group.
Figure 6-9 Error Message Queue Group
Last Message Entered
Next Message Entered
First Message Entered
Last Message
to be Read
First Message
to be Read
SYSTem: ERRor?
Error Message Queue