Rockwell Automation 1783-BMxxx Stratix 5700 Ethernet Managed Switches User Manual - Manual (Page 49)

Rockwell Automation Publication 1783-UM004E-EN-P - June 2014 49
Switch Installation Chapter 2
Wire the External Alarms
The switch has two alarm input and one Form C (single-pole, double-throw)
alarm output relay circuits for external alarms. The input alarm relay circuits are
designed to sense if the alarm input is open or closed relative to the alarm input
reference pin. The output alarm relay circuit has a single Form C relay, with one
normally open (NO) and one normally closed (NC) contact. You can configure
the output alarm relay as either normally energized or normally de-energized by
using the CLI.
Refer to Appendix C for an alarm wiring example.
Alarm signals are connected to the switch through the 6-way alarm relay
connector. Three connections are dedicated to the two alarm input circuits:
• Alarm input 1 (IN1)
• Alarm input 2 (IN2)
• Isolated reference ground
An alarm input and the reference ground wiring connection are required to
complete a single input alarm circuit. You must provide either an NO or an NC
dry contact to complete the alarm circuit between reference ground and IN1 or
IN2.
The three remaining connections for the Form C output alarm circuit are as
follows:
• NO output
• NC output
• common
An alarm output and the common wiring connection are required to complete a
single output alarm circuit. The Form C output alarm relay provides one NO and
one NC dry contact.
ATTENTION: Do not apply an external voltage source to either the IN1 or IN2
alarm inputs. Limit alarm output wiring to 48 V DC, 0.5 A.
ATTENTION: Wire connections to the power and relay connector, must be UL-
and CSA-rated, style 1007 or 1569 twisted-pair copper appliance wiring
material (AWM) wire.