Circuits and Devices
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Instructions and other documentation provided with the addressable devices, bases, and isolators for further
information. The system will automatically limit the maximum number of device LEDs which can be
illuminated to 15.
Analog Devices
The system supports Summit SI-200 Series photo, ion, multi-sensor and thermal (heat) type analog detectors, as
well as contact input and output devices. The detectors may be configured as non-verified or verified alarm inputs.
To determine an alarm condition, the system polls the analog device and compares the analog value against stored
thresholds for pre-alarm and alarm conditions.
A range of thresholds is provided for each type of analog device (except for contact devices), corresponding to the
agency approved range of threshold for a particular device type. Each device can be individually configured to a
value in the range of threshold for “day time” and one for the “night time” or after hours operation; i.e. a device may
be configured to a low sensitivity for “day time” and high sensitivity at “night time”. The day time threshold will be
used unless the after hours operation is active.
Drift Compensation
The SFC-500 will automatically adjust for gradually increasing affects of dust and other accumulations of dirt in the
detectors. It will adjust the thresholds to compensate for a detector going dirty according to the gradual change in
the normal clean air value received. When it can no longer compensate for an increasingly dirty detector, a dirty
detector trouble is indicated for that device.
Auto Test
Periodically each detector is commanded to return an alarm value to test its ability to alarm. If it fails the test, a
trouble is indicated on that device. This trouble is latched until system reset.
Contact Inputs
Contact input modules on the addressable/analog device loop may be configured as any of the following input types:
• non-verified alarm inputs
• waterflow inputs
• non-latching supervisory inputs
• latching supervisory inputs
• monitor inputs
• trouble only inputs
• remote switch inputs
Contact Outputs
Contact output modules on the addressable/analog device loop may be configured as any of the following output
types:
• signals
• strobes
• relay outputs
Analog devices may be installed with relay or sounder bases. The outputs of these bases are activated when the
device active LED turns ON steady in response to an alarm. The command to activate the output is separate from
the command that activates the LED and they are not subject to the same restrictions as the LED. Output modules
configured as signals are not stroked by software at the current signal rate. When the system commands
them to be either in alert or in evacuation, the panel will simply activate them continuously. It is possible to provide
stroked operation by connecting the signal power to a conventional signal output which is stroking at the correct rate
when the device is active. Depending on the device, the system can detect open and short troubles and report it as
an output circuit trouble.
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