Rosslare AC-215IP - Normally Open Supervised Double Resistor Input Connection

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 2.2K 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)