Input and Output Requirements
Normally Open Supervised Double Resistor Input Connection
Connect a 2.2K resistor in series to the input switch contacts.
Connect an 8.2K resistor parallel to the input switch contacts.
Normally Open Supervised Input has 3 states:
1) Switch Open - Normal State:
Loop resistance = 10.4K.
2) Switch Closed – Abnormal State:
Loop resistance = 2.2K.
3) Open circuit (Infinite loop resistance) or short circuit (0
resistance) across input terminals - Trouble State.
Figure 11: Normally Open Supervised Input (Double Resistor)
AC-225 Hardware Installation and User Guide Page 20
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