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Input and Output Connections

AC-215IP Hardware Installation Manual 23

4.1.5 Normally Closed Supervised Single Resistor Input Connection

Connect a resistor of 2.2 K in series to the input switch contacts.

Normally Closed Supervised Input has 3 states:

 Switch Closed – Normal State:

Loop resistance = 2.2 K

 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)

4.1.6 Normally Closed 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 Closed Supervised Input has 3 states:

 Switch Closed – Normal State:

Loop resistance = 2.2 K

 Switch Open – Abnormal State:

Loop resistance = 10.4 K

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

input terminals – Trouble State

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Rosslare AC-215 Installationshandbuch Seite 23