Chapter 3: Operating instructions
58 EST3X Technical Reference Manual
Disabling and enabling logic groups
A logic group is an object that is created in the 3-SDU. Groups are required in
order to execute certain system functions, but groups bear no physical
relationship to the system. For example, smoke detectors can be assigned to the
same Zone group even though they are not attached to the same wire run.
Disabling a group isolates it from the system. While the group is disabled, the
EST3X control panel is prevented from processing status change signals from
every device in the group until the device is enabled. For example in a Zone
group, the control panel does not activate an alarm event when you activate a
disabled detector, but it will after the detector is enabled.
The control panel keeps track of how many times you disable a group without
enabling it. You must enable a group the same number of times you disable it in
order to return the group to its original condition.
Note: If you disabled a Zone group by disabling all of the devices in the zone,
enabling the zone enables all of the devices in the zone.
The logic groups are listed below.
• AND group: A collection of devices that are grouped in the database to
provide a group response that is separate from that of its member devices. An
AND group activates when a specified number of devices change to a
specified state. The specified state can be alarm, supervisory, trouble,
monitor, or not active (NA). AND groups can be configured to signal an alarm,
supervisory, trouble, or monitor condition upon activation.
• Matrix group: A collection of devices that are grouped in the database to
provide a unique system response when a specified number of its members
signal an alarm event or when more than one device in a defined search
radius signals an alarm event. A member's alarm, supervisory, trouble, or
monitor state’s active status serves as an input for activating the AND group.
• Service group: A collection of devices that are grouped together in the
database to provide a unique response for testing purposes. When enabled,
the Service group automatically disables the member device's normal alarm
response, and provides a common alternate test response.
• Guard patrol group: A collection of guard station devices that are grouped in
the database to provide a unique system response when any member of the
group fails to change to the active state in the correct order or within specified
time limits.
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