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Cisco ISA 3000 Industrial Security Appliance Hardware Installation Guide
Chapter 3 Connecting the ISA 3000
Connecting Alarm Circuits
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 device to an external alarm device, follow these steps:
Step 1
Remove the captive screws that hold the alarm connector on the device, and remove the connector from
the device chassis.
Step 2
Measure two strands of twisted-pair wire (18-to-20 AWG) long enough to connect to the external alarm
device.
You can choose between setting up an external alarm input or output circuit.
Step 3
Use a wire stripper to remove the casing from both ends of each wire to 0.25 inch (6.3 mm) ± 0.02 inch
(0.5 mm).
Do not strip more than 0.27 inch (6.8 mm) of insulation from the wires. Stripping more than the
recommended amount of wire can leave exposed wire from the alarm connector after installation.
Step 4
Insert the exposed wires for the external alarm device into the connections based on an alarm input or
output circuit setup.
For example, to wire an alarm input circuit, complete the IN1 and REF connections in
Figure 3-7
Table 3-2
Alarm Connector (Top to Bottom)
Pin
Connection
1
Alarm Output Normally Open (NO) connection
2 (COM)
Alarm Output Common connection
3
Alarm Output Normally Closed (NC) connection
4 (IN2
Alarm Input 2
5 (REF)
Alarm Input Reference Ground connection
6 (IN1)
Alarm Input 1