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Input and Output Connections

22 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 2.2 K in series to the input switch contacts.

Connect a resistor of 8.2 K parallel to the input switch contacts.

Normally Open Supervised Input has 3 states:

 Switch Open – Normal State:

Loop resistance = 10.4 K

 Switch Closed – Abnormal State:

Loop resistance = 2.2 K

 Open circuit (infinite loop resistance) or short circuit (0 resistance) across

input terminals – Trouble State

Figure 12: Normally Open Supervised Input (Double Resistor)

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