Rosslare AC-825IP Installation & User Guide

Figure 23: Normally Open Input Connection
4.1.2. Normally Closed Input Connection
A 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 24: Normally Closed Input Connection
4.1.3. Normally Open Supervised Single EOL Resistor Input Connection
Connect an 8.2 kΩ resistor in parallel to the input switch contacts.
A Normally Open Supervised Input has 3 states:
•
Switch Open – Normal State:
Loop resistance = 8.2 kΩ
•
Switch Closed – Abnormal State:
Loop resistance = 0 (short circuit)
•
Open circuit across input terminals – Trouble State:
Loop resistance = Infinite (open circuit).
AC-825IP Installation & User Guide
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Rosslare AC-825IP Specifications

General

Brand	Rosslare
Model	AC-825IP
Category	Controller
Language	English