Normally Open Supervised Double Resistor Input Connection; Figure 11: Normally Open Supervised Input (Single Resistor); Figure 12: Normally Open Supervised Input (Double Resistor) - Rosslare AC-215IP Installation Manual

Input and Output Connections

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)

22 AC-215IP Hardware Installation Manual