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Input and Output Requirements
Figure 12: Normally Open Supervised Input (Single Resistor)
Normally Open 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 Open Supervised Input has 3 states:
1) Switch Open – Normal State:
Loop resistance = 8.2K
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
AC-525 Hardware Installation and User Guide
Page 21
Содержание AC-525
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