IFC Networking—Metasys Intelligent Fire Network
41
In a bus configuration, as in point-to-point, only one node can provide
ground fault detection along the bus. The primary difference is that
one node must provide ground fault detection for multiple nodes along the
bus.
Example 1
The node seconds from the right in Figure 16, provides the ground fault
detection, and thus, must be an IFC panel. SW1 (Port A) is set to the On
position to enable ground fault detection feedthrough from the MIB on this
node. All other nodes have ground fault detection on the MIB disabled.
(This means that the ground fault detection resistor, R27, on the MPS-24A
must be cut.) This includes the node on the far left of the figure, since
ground fault detection from the active detection circuit in the second from
the right node has been passed through the RPT-W by having its SW3
switch in the On position.
Ground Fault Detection
Disabled
Power
Supply
Power
Supply
Power
Supply
Power
Supply
Node
IFC Node
gfdbus
MIB-W
MIB-W
MIB-W
MIB-W
RPT-W
On
Ports
Ports
Ports
Ports
Ports
Twisted Pair Wire
Twisted Pair Wire
Ground Fault Detection
Enabled
A
B
SW2
Off
A
B
SW3
SW1
Off
A
B
A
B
A
B
SW1
On
SW1
Off
Node
Ground Fault Detection
Disabled
Ground Fault Detection
Disabled
Ground Fault Detection
Disabled
Node
Ground Fault Detection
Disabled
Figure 16: Bus (Example 1)
Bus
Configuration
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