System 9000TS
11
First-Up Alarms
When a group of alarms is initiated, it is often critical to know the first alarm to occur
within the group as it allows the user to quickly identify the primary cause of failure.
This should reduce downtime and allow the plant to be returned to the operational
state in the shortest possible time. A printout of events to a 1mS resolution and or a
First-Up alarm sequences can be used to identify the primary cause of failure.
System Relays
Eight relays are provided within the P925TS-X Interface Card comprising two horn
relays and six common relays, which can be software configured to provide common
alarm group or failure alarm contacts for use with 3
rd
party devices.
Time Delays
Whilst some of the alarms in the system may require events to be captured to a 1ms
resolution some of the alarms may not need to respond in the same manner. Input
Cards are therefore provided with incremental time delays that allow the user to
configure each channel to activate and / or de-activate after a pre-set time limit has
elapsed. Each channel can be selected between 1 and 65,000ms
Auto Shelve
When high-speed events are being captured and stored in logs a faulty input contact
to an alarm channel can quickly fill the associated event buffers. Each channel can be
software configured to automatically shelve an alarm if the frequency of alarms
exceeds the specified norm within a defined time period. Once the channel returns to
set limits it will be automatically removed from auto shelve and will carry on
responding in the normal way. When auto-shelve occurs the event is stored in memory
and printed as required.
Sleep Mode
In applications where plant areas are not manned on a permanent basis – Sleep Mode
– can be used to disable the output drives to Displays and Audibles. This feature is
used to minimise drain on the primary power source, (typically batteries), and to
prevent unnecessary noise pollution.
Sleep mode is a standard feature of the 9000TS System and it is important to note that
whilst in this mode the logic continues to respond to alarms in the normal manner. The
pushbutton functions are disabled during sleep mode to ensure that once this feature
has been turned off the operator can use the associated pushbuttons to control the
alarms in the normal way.