2-26
Cisco IE 4000 Switch Hardware Installation Guide
Chapter 2 Switch Installation
Connecting Alarm Circuits
Step 6
Repeat
Step 2
through
Step 5
to insert the input and output wires of one additional external alarm device
into the alarm connector.
Figure 2-14
shows the completed wiring for two external alarm devices. The first alarm device circuit is
wired as an alarm input circuit; the IN1 and REF connections complete the circuit. The second alarm
device circuit is wired as an alarm output circuit that works on a normally open contact basis; the NO
and COM connections complete the circuit.
Figure 2-14
Completed Connections for Three External Alarm Devices on the Alarm Connector
Attaching the Alarm Connector to the Switch
Warning
Failure to securely tighten the captive screws can result in an electrical arc if the connector is
accidentally removed.
Statement 397
Warning
When you connect or disconnect the power and/or alarm connector with power applied, an
electrical arc can occur. This could cause an explosion in hazardous area installations. Be sure
that all power is removed from the switch and any other circuits. Be sure that power cannot be
accidentally turned on or verify that the area is nonhazardous before proceeding.
Statement 1058
1
IN1 wired connection
3
COM wired connection
2
REF wired connection
4
NO wired connection
33
2047
1
2
3
4
