Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 41)

MOD30ML and Modcell Maintenance
VIEWING DIAGNOSTIC DATA
o ACK ONLY - Diagnostics resulting from a momentary occurrence where the
abnormal condition is not sustained. This class is sometimes accompanied
by a counter attribute, which counts the number of occurrences.
• Status - The diagnostic status at the time the read command is received (UAK G
ACT G in the example). This status data indicates that the diagnostic is
unacknowledged (UAK), unacknowledged attribute quality is good (G), diagnostic
condition is active (ACT), and active status quality is good (G). After
acknowledgement, the status changes to ACK G ACT G.
Figure 3.23. Instrument Status - ViZapp
Diagnostic History
When the System Event block is configured to report all diagnostics, the block stores both
new/clear and acknowledge only diagnostics reported by the data base blocks. Viewing the
system event queue provides data on all diagnostics, which have occurred since the current
data base was down loaded or the queue was cleared. The command for reading the queue
is:
R Q
This command returns the most recent event first (other types of system events such as
informational only, process alarms etc. are stored with the diagnostic events). The screen
displays up to 15 events and a prompt to continue appears if necessary. An example of an
event queue entry is as follows;
13:17:54:741 05/23/96 CLR/ACK
IF1 41 I/O IS LOCKED
The first line lists the time the diagnostic was reported, the date, and a transition message
(CLR/ACK). The second line lists the block type and occurrence number (IF1), event code
number (41), and diagnostic message text. See Section 7.2 for a description of the transition
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