2-23
Cisco IE 4000 Switch Hardware Installation Guide
Chapter 2 Switch Installation
Connecting Alarm Circuits
Connecting Alarm Circuits
After the switch is installed, you are ready to connect the DC power and alarm connections.
• Wiring the Protective Ground and DC Power for Alarm Circuits, page 2-23
• Wiring the External Alarms, page 2-23
Wiring the Protective Ground and DC Power for Alarm Circuits
For instructions on grounding the switch and connecting the DC power, see the “Grounding the Switch”
section on page 2-9.
Wiring the External Alarms
The switch has two alarm input and one alarm output relay circuits for external alarms. The alarm input
circuits are designed to sense if the alarm input is open or closed relative to the alarm input reference
pin. Each alarm input can be configured as an open or closed contact. The alarm output relay circuit has
a normally open and a normally closed contact.
Alarm signals are connected to the switch through the six-pin alarm connector. Three connections are
dedicated to the two alarm input circuits: alarm input 1, alarm input 2, and a reference ground. An alarm
input and the reference ground wiring connection are required to complete a single alarm input circuit.
The three remaining connections are for the alarm output circuit: a normally open output, a normally
closed output, and a common 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 in Table 2-3.
Warning
Explosion Hazard—Do not connect or disconnect wiring while the field-side power is on; an
electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure
that power is removed or that the area is nonhazardous before proceeding.
Statement 1081
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, 1.0 A or 48 VDC, 0.5 A.
Table 2-3 Alarm Connector Labels (Top to Bottom)
Label Connection
NO Alarm Output Normally Open (NO) connection
COM Alarm Output Common connection
NC Alarm Output Normally Closed (NC) connection
IN2 Alarm Input 2
REF Alarm Input Reference Ground connection
IN1 Alarm Input 1
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