Johnson Controls Metasys Intelligent Fire Network Technical Manual page 38

38 IFC Networking—Metasys Intelligent Fire Network
Example 1
In the example in Figure 13, the node on the left provides the ground fault
detection, and thus, the node must be an IFC-1010/2020. SW2 (Port B) of
the MIB on the left is set to the On position to enable ground fault
detection on Port B. The RPT-W feedthrough switch (SW3) is On,
allowing the left node to provide ground fault detection for the
two point-to-point wire connections on the left and the right of the
repeater. The Port A switch, SW1, on the right MIB-W is set to the Off
position, disabling ground fault detection feedthrough from the node on
the right. The node on the right can be any network node, including
another IFC panel, a Fire-Net NCM, a Fire OWS, or a remotely powered
INA.
Twisted Pair Wire
B
A Ports
SW2
On
Ground Fault
Detection
Enabled
MIB-W
Power
Supply
IFC Node
Figure 13: Point-To-Point (Example 1)
Twisted Pair Wire
A Ports B
SW3
On
Ground Fault
Feedthrough
Enabled
RPT-W
A B
Ports
SW1
Off
Ground Fault
Detection
Disabled
MIB-W
Power
Supply
Node
gfd2