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Input and Output Connections
22
AC-225x-B Series Hardware Installation and User Manual
▪
Open circuit (infinite loop resistance) or short circuit (0 resistance) across
input terminals
–
Trouble State.
Figure 13: Normally Open Supervised Input Connection (Double Resistor)
4.1.5
Normally Closed Supervised Single Resistor Input Connection
Connect a 2.2 k
Ω
resistor in series to the input switch contacts.
Normally Closed Supervised Input has 3 states:
▪
Switch Closed
–
Normal State:
Loop resistance = 2.2 k
Ω
▪
Switch Open
–
Abnormal State:
Loop resistance = Infinite (open circuit)
▪
Short circuit across input terminals
–
Trouble State:
Loop resistance = 0 (short circuit)
Figure 14: Normally Closed Supervised Input Connection (Single Resistor)