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Input and Output Connections

AC-215IP Hardware Installation Manual 21

Figure 9: Normally Open Input Connection

4.1.2 Normally Closed Input Connection

Normally Closed Input has two states:

 Switch Closed – Normal State:

Loop resistance = 0 (short circuit)

 Switch Open – Abnormal State:

Loop resistance = Infinite (open circuit)

Figure 10: Normally Closed Input Connection

4.1.3 Normally Open Supervised Single Resistor Input Connection

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

Normally Open Supervised Input has 3 states:

 Switch Open – Normal State:

Loop resistance = 8.2 K

 Switch Closed – Abnormal State:

Loop resistance = 0 (short circuit).

 Open circuit across input terminals – Trouble State:

Loop resistance = Infinite (open circuit).

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Rosslare AC-215 Manuale di Installazione Pagina 21