Si - Local Inputs
The Sigma SI status unit is compatible with
the Sigma XT extinguishing control panel.
Up to 7 Sigma SI status units may be connected
to the Sigma XT control panel.
There are four different hardware versions
of the status unit
• 6 lamp (indication only – no
• 6 lamp with mode select key switch
• 6 lamp with mode select and manual
• 10 lamp (additional Zone 1-3 Fire
and General Fault lamps) with mode select
and manual release
These four versions are available in either
IP30 (standard) enclosures or IP65 weatherproof
The status unit provides a clear indication
of the state of the Sigma XT panel and also
has a 2 digit 7-segment display for the release
In addition to the optional front panel mounted
controls, ALL models have two monitored inputs
provided as standard. These two inputs are
• MODE – This
input provides an additional facility to put
the Sigma XT into manual only mode. Typically
this can be wired to door lock switches, to
put the panel into manual only mode when the
door to the protected area is unlocked.
• HOLD – This
input can be wired to a local “Hold
off” switch. When operated during the
activated (2nd stage) condition, the release
delay countdown timer will be reset to the
maximum value and will be paused for the duration
that this input is active. When the input
is cleared, the release delay countdown timer
will resume from the maximum configured time.
Whilst the Sigma XT panel also
has these two monitored inputs as standard,
there may be a significant saving in the installation
costs if the mode switch or hold off button
is located near to the status unit.
Note – EN12094-1 requirements specify
that for a fault on any HOLD input must put
the Sigma XT panel into a permanent Hold condition.
There are fault indicators fitted to the Sigma
SI status unit PCB to show a fault condition
on either of the monitored inputs.
Please contact any member of the Technical
Support or Customer Service departments if
you require additional information.
the Sigma Si manual:
Sigma XT manual: