Input and Output Requirements
Figure 14: Normally Closed Supervised Input (Single Resistor)
Normally Closed Supervised Double Resistor Input Connection:
Connect a 2.2K resistor in series to the input switch contacts.
Connect an 8.2K resistor in parallel to the input switch contacts.
Normally Closed Supervised Input has 3 states:
•
Switch Closed – Normal State:
Loop resistance = 2.2K
•
Switch Open – Abnormal State:
Loop resistance = 10.4K
•
Open circuit (Infinite loop resistance) or short circuit (0 resistance)
across input terminals – Trouble State
AC-525 Hardware Installation and User Guide
Page 23
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