Cisco Catalyst IE 3 00 Series Installation Manual page 21

Switch Installation
signal. An alarm output and the common wiring connection are required to complete a single alarm output
circuit.
The labels for the alarm connector are on the switch panel and are displayed below.
Label
NO
COM
NC
IN2
REF
IN1
Caution
The input voltage source of the alarm output relay circuit must be an isolated source and limited to less than
or equal to 24 VDC, 1.0A or 48VDC, 0.5A.
Caution
To reduce risk of electric shock and fire, the alarm ports must be connected to an IEC60950/IEC 62368
compliant limited power source.
Note Wire connections to the power and alarm connectors must be UL- and CSA-rated, style 1007 or 1569
twisted-pair copper appliance wiring material (AWM) wire.
To wire the switch to an external alarm device, follow these steps:
1. Remove the captive screws that hold the alarm connector on the switch, and remove the connector from
the switch chassis.
Wiring the External Alarms
Connection
Alarm Output Normally Open (NO) connection
Alarm Output Common connection
Alarm Output Normally Closed (NC) connection
Alarm Input 2
Alarm Input Reference Ground connection
Alarm Input 1
Switch Installation
21