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4.3.4. Adding Loop Expanders
The loop expanders are periphery devices in iRIS4 system configuration. According the physical place of mounting,
every loop expander takes a system factory address that cannot be changed – see item
about the periphery devices addressing.
The connection between the loop expanders is via interface connectors for coupling the modules to each other.
iRIS4 Outputs
Control Module
(Address 2)
4.3.5. Finding Short-Circuit in the Loop Line
The connection diagram shown on Figure 23, gives the possibility to provide operation of the loop in case of short-circuit
fault, using devices with built-in isolator modules. For example, short-circuit in section 2 will not influence the operation
of sections 1 and 3. The isolator modules at the both ends of section 2 will isolate it, and section 1 and 3 will continue
working properly, as section 1 will operate by supply from the channel "A" and section 3 - by supply from channel "B".
Since the fire panel will not be able to communicate with the devices from section 2, it will generate an alarm signal for
lost devices and open circuit.
The maximum recommended number of devices between two isolator modules (module isolator device or
using the built-in module isolator in a device) is 30!
Device with isolator
Loop 1
Expander
(Address 3)
Section 3
Channel В
iRIS4 - Addressable Fire Alarm Panel – Installation Manual
1 - Connect the interface connectors of the
first and the second loop expanders.
2 - Fix the second loop expander to the
Loop 2
metal carrier of the panel.
Expander
(Address 4)
The Loop expanders must be added or
removed from the system configuration
only when the main and back-up power
supplies are off!
Figure 22
Section 2
Section 1
Channel А
Figure 23
21
5.1
for general information
Device with isolator
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