Chapter 6 Clock Module Reference Data
Communications Module
158 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
Alarm Logic
Events are an indication that something has occurred within the unit. Alarms are a
subset of events. All alarms are events, but not all events are alarms. All events log
the following information:
Timestamp
Event type
Event/alarm level
Condition that caused the event
Communications Module Event Log
The Communications module maintains an event history of the last 500 events in
non-volatile RAM that can be retrieved by the user. In the interactive mode, the
Communications module always returns the events with the last generated event
output last.
Using one of the available communication ports, a user can request the following:
List of events by a given type of REPORT or ALARM
List of events based upon a start and stop time
Clear the event log
Interactive mode ports can request:
Latest event logged
A number of last events be displayed
All information currently logged in the history buffer
Alarm Levels
The Communications module alarm logic incorporates three alarm levels:
CRITICAL Alarms – This class of alarms that require immediate user
intervention. When a critical alarm condition is detected, the CRITICAL ALARM
relay at the back of the SSU-2000e is activated and the CRITICAL ALARM LED
on the front of the Communications module lights red.
MAJOR Alarms – A class of alarms that may require immediate user intervention.
When a major alarm condition is detected, the major alarm relay at the back of
the SSU-2000e is activated and the MAJOR ALARM LED on the front of the
Communications module lights red.
MINOR Alarms – A class of alarms that indicate the unit performance is
degrading. The minor relay is activated and the MINOR ALARM indicator lights.
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