Rosslare AC-225? AC-225IP? AC-225U Guida Utente Scaricare il pdf (Pagina 22)

Input and Output Requirements

Normally Closed Supervised Single Resistor Input Connection

Connect a 2.2K resistor in series to the input switch contacts.

Normally Closed Supervised Input has 3 states:

• Switch Closed - Normal State:

Loop resistance = 2.2K.

• Switch Open – Abnormal State:

Loop resistance = Infinite (open circuit).

• Short circuit across input terminals - Trouble State:

Loop resistance = 0 (short circuit).

Figure 12: Normally Closed Supervised Input (Single Resistor)

Normally Closed 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 Closed Supervised Input has 3 states:

• Switch Closed - Normal State:

Loop resistance = 2.2K.

• Switch Open – Abnormal State:

Loop resistance = 10.4K.

AC-225 Hardware Installation and User Guide Page 21

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