Rosslare AC-225? AC-225IP? AC-225U Guida Utente Scaricare il pdf (Pagina 21)

Input and Output Requirements

Normally Open 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 Open Supervised Input has 3 states:

1) Switch Open - Normal State:

Loop resistance = 10.4K.

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.

Figure 11: Normally Open Supervised Input (Double Resistor)

AC-225 Hardware Installation and User Guide Page 20

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Rosslare AC-225? AC-225IP? AC-225U Guida Utente Pagina 21