Siemens MXL-IQ Operation, Installation, And Maintenance Manual page 159

Basic Two Stage System
The figure on page L-6 demonstrates 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_INH
Any Alarm Trigger (ALL)
True Enable
False
Typical RESET INHIBIT Timer Function
Using Reset Inhibit with Timer
Run Reset Inhibit
30 Sec
Start Timer
Cancel
Keyswch
OR
List of
(ANY)
Keyswitch
Inputs
Typical ANY KEYSWITCH Function
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.
• In either stage, the audible silence flag/
key controls the silencing and
unsilencing of the coded audibles.
• The Panel Reset flag is used to assure
timers and latches are reset for the
next event after reset.
Any Alarm
True
Panel Reset
Typical Signal Silence Inhibit Function
Any_keyswch
Any alarm
AND
(ALL)
SS_INH
Trigger (ALL)
Two Stage
Run
Audible Silence
Enable
Start Timer
Cancel
Appendix L
L-5