Cisco Systems IE200016TCB, IE20004TSB, IE20004TSL Wiring the External Alarms, Label Connection

Chapter 2 Switch Installation

Connecting Alarm Circuits

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.

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

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.

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 (such as Belden part number 9318).

To wire the switch to an external alarm device, follow these steps:

Step 1 Remove the captive screws that hold the alarm connector on the switch, and remove the connector from the switch chassis. See Figure 2-21.

	Cisco IE 2000 Switch Hardware Installation Guide
OL-25818-04		2-35