Rosslare AC-215IP - Normally Closed Input Connection; Normally Open Supervised Single Resistor Input Connection

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 8.2K in parallel to the input switch contacts.
Normally Open Supervised Input has 3 states:
 Switch Open – Normal State:
Loop resistance = 8.2K
 Switch Closed – Abnormal State:
Loop resistance = 0 (short circuit).
 Open circuit across input terminals – Trouble State:
Loop resistance = Infinite (open circuit).