Interlogix FlexZone Series Product Manual page 21

Chapter 1: System planning
To take advantage of the Silver Network's redundant communications capability,
two of the connected processors require NICs and connections to a Network
interface unit (NIU). In this way network communications will travel in both
directions over the sensor cables, so that a single break in a sensor cable will not
interrupt communications.
Grounding considerations
The FlexZone sensor system must have a single ground reference. A stable low
resistance earth ground is required at each power supply node, and the
FlexZone system is referenced to this ground. Use a short length of heavy gauge
copper wire to connect the power supply to an approved low resistance earth
ground. For a single, standalone processor, or for processors using PoE, the
ground connection is made at the processor location using the ground lug on the
bottom of the enclosure. Consult the local electrical code for grounding
information.
Alarm monitoring
Alarm monitoring is site specific and depends on whether you are using relay
outputs for alarm reporting (Local control mode) or Silver Network based alarm
reporting (Remote control mode).
Each processor has four user-configurable Form C relay outputs. In Local control
mode, the four relays are used to signal alarm and supervision conditions. For
network based processors, alarm data is carried over the network cables and the
four relays are available as output control points from the security management
system (SMS).
It is recommended to set up a Silver Network, even when using Local control
mode. This enables remote calibration, maintenance and diagnostic access to
your FlexZone processors from a central control facility.
NM Mode
The FlexZone processor can be configured to report alarm and supervision
conditions through the UltraLink modular I/O system. In NM Mode, the UltraLink
I/O processor acts as the Network Manager, providing alarm outputs for a
connected network of up to eight Silver devices. In NM Mode, the Silver devices
do not require a connection to a PC running Silver Network Manager software.
Sensor alarms and supervision conditions are assigned to UltraLink I/O outputs
(relay or open collector). When an alarm occurs on a connected sensor, the
corresponding UltraLink I/O output is activated (see Appendix C "NM Mode" on
page 93 for additional details).
Auxiliary inputs
The processor includes two auxiliary device/self-test inputs. In Local control
mode the inputs are used to activate electronic self-tests. In Remote control
mode the auxiliary inputs are used to report the status of two auxiliary security
devices to the security management system.
FlexZone™ Product Guide
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