M - 5
Appendix M
It is important to note that other Two
Stage writable flags used in the previous
Two Stage implementation are not used
in the new Two Stage implementation.
Keyswitch Devices
There are two keyswitch types avail-
able in the MXL. All logic associated
with a keyswitch device is CSG-M
programmable. The only MXL defined
aspects of a keyswitch are as follows:
Keyswitch Type 1
1. If a Type 1 keyswitch is activated, an
alarm event will result.
2. The event will be recorded on the
alarm queue and all standard MXL
functions associated with an alarm
will occur (that is, the ANY ALARM
flag will be set to TRUE, the ANY
NEW ALARM flag will pulse, etc.).
3. This is true even if there are no
previous alarms.
Keyswitch Type 2
1. If a Type 2 keyswitch is activated
when no alarms are present in the
system, it will result in a trouble
condition at the MXL.
2. If an alarm is detected while this
trouble condition is present on the
trouble queue, the active Type 2
keyswitch will be added to the
system as an alarm event (added to
alarm queue).
3. If the keyswitch is activated when
an alarm is present in the system,
the keyswitch will be treated as an
alarm.
All other system behavior is deter-
mined by output logic design.
Sample Two Stage Systems
Using Reset Inhibit with Timer
This figure (see page M-6) shows
methods of implementing Reset Inhibit
with a timer, creating an ANY
KEYSWITCH function/flag and a timer
based signal silence inhibit function.
Keep in mind that your implementation
of these features may vary from the
examples shown. If Reset Inhibit or
Two Stage Audible Silence are not
required in your system, then refer-
ences to these flags are not required in
the logic design.
Basic Two Stage System
This figure (see page M-7) demon-
strates a basic Two Stage system
design. Its operation is summarized
below:
This system will output Stage 1
audibles when the first alarm
occurs.
If the alarm is not acknowledged
prior to the expiration of
stg1_timer
, coded audibles will be
forced output Stage 2 audibles.
If the alarm is acknowledged
during Stage 1, only a keyswitch
will place the system in the
second stage.
If the system is reset after the
alarm has been acknowledged and
coded audibles silenced, the
system may be reset (provided
the RESET INHIBIT logic permits).
If a keyswitch is activated after the
ANY_ALARM flag is TRUE, the
system will output the second
stage audibles.
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Содержание Cerberus PYROTRONICS MXL
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Страница 281: ...4 114 XLD 1 Connections and Ratings Technical Manuals Online http www tech man com firealarmresources com ...
Страница 301: ...4 134 ZC2 8B Connections and Ratings Technical Manuals Online http www tech man com firealarmresources com ...
Страница 309: ...A 2 Appendix A Technical Manuals Online http www tech man com firealarmresources com ...
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