Juniper MX104 - Figure 4: Sample Output Alarm-Reporting Device; Table 4: Alarm Relay Contact Functions

Table 4: Alarm Relay Contact Functions
FunctionContact Name
Contact
Name
Current is not flowing through Contact 1 and Contact 2
[REF] when operating normally. When the current flows,
the closed alarm is generated.
Normally Open [NO]Contact 1
Current is flowing through Contact 1 and Contact 2 [REF]
when operating normally. When the current stops
flowing, the open alarm is generated.
Normally Closed [NC]
Provides the current path for the external alarm-reporting
device and functions as a reference or negative potential
terminal for Contact 1.
Reference [REF]Contact 2
Figure 4 on page 10 shows an example of a wiring diagram for a simple output
alarm-reporting device. In this case, the device is a light bulb that illuminates when the
device encounters a condition that activates the red alarm LED and relay contacts. The
alarm relay contacts can also be used to activate other devices such as bells or buzzers.
Figure 4: Sample Output Alarm-Reporting Device
Figure 5 on page 11 shows an example of a wiring diagram for a simple input
alarm-reporting device. In this case, the push button switch is an alarm sensor that triggers
an input alarm when a door-open condition occurs.
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MX104 3D Universal Edge Router Hardware Guide