Input and Output Connections
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AC-215IP Hardware Installation Manual
Figure 11: Normally Open Supervised Input (Single Resistor)
4.1.4
Normally Open Supervised Double Resistor Input Connection
Connect a resistor of 2.2K in series to the input switch contacts.
Connect a resistor of 8.2K parallel to the input switch contacts.
Normally Open Supervised Input has 3 states:
Switch Open – Normal State:
Loop resistance = 10.4K
Switch Closed – Abnormal State:
Loop resistance = 2.2K
Open circuit (infinite loop resistance) or short circuit (0 resistance) across
input terminals – Trouble State
Figure 12: Normally Open Supervised Input (Double Resistor)