Rosslare AC-225? AC-225IP? AC-225U Guia do Utilizador descarregar pdf (Página 20)

Input and Output Requirements

Normally Open Supervised Single Resistor Input Connection

Connect an 8.2K resistor in parallel to the input switch

contacts.

Normally Open Supervised Input has 3 states:

• Switch Open - Normal State:

Loop resistance = 8.2K.

• Switch Closed – Abnormal State:

Loop resistance = 0 (short circuit).

• Open circuit across input terminals - Trouble State:

Loop resistance = Infinite (open circuit).

Figure 10: Normally Open Supervised Input (Single Resistor)

AC-225 Hardware Installation and User Guide Page 19

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Rosslare AC-225? AC-225IP? AC-225U Guia do Utilizador Página 20