Input and Output Connections
AC-215x-B Series Hardware Installation Manual
23
Figure 12: Normally Open Supervised Input (Double Resistor) Connection
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 13: Normally Closed Supervised Input (Single Resistor) Connection
