Rosslare AC-425, Руководство по установке оборудования и инструкция пользователя

Страница: 22 / 39

¡Error! Utilice la ficha Inicio para aplicar Heading 1 al texto que desea que
aparezca aquí.
24 AC-425 Hardware Installation and User Guide
A Normally Open Supervised Input has 3 states:
 Switch Open – Normal State:
Loop resistance = 10.4 k
Ω
 Switch Closed – Abnormal State:
Loop resistance = 2.2 k
Ω
 Open circuit (infinite loop resistance) or short circuit (0 resistance) across input
terminals – Trouble State
Figure 12: Normally Open Supervised Input (Double Resistor)
4.1.5 Normally Closed Supervised Single EOL Resistor Input
Connection
Connect a 2.2 k Ω resistor in series to the input switch contacts.
A Normally Closed Supervised Input has 3 states:
 Switch Closed – Normal State:
Loop resistance = 2.2 k
Ω
 Switch Open – Abnormal State:
Loop resistance = Infinite (open circuit)
 Short circuit across input terminals – Trouble State:
Loop resistance = 0 (short circuit)