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 kΩ resistor in series to the input switch contacts.
Normally Closed Supervised Input has 3 states:
▪ Switch Closed – Normal State:
Loop resistance = 2.2 kΩ
▪ 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)
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