Rockwell-automation T80004 Application Note Field Loop Configuration Manuale Utente Scaricare il pdf (Pagina 12)

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AN-T80004 Field Loop Configuration

Issue 10 Jun 13 AN-T80004 12

For field powered devices, sourcing current, where the channel current could go below 4mA (e.g. gas

detector optics alarms):

Since the current loop is on the negative side of the channel power, it is possible to configure the

T8834 FTA to power and sense current-sinking devices, where the loop draws current away from the

channel. Current sinking devices need a separate power supply.

Product description PD-T8834 shows the full circuit diagram of a channel. The circuit includes links

which could be modified to accommodate other requirements.

Isolated PSU

+

-

TB1 A

TB1 B

100R

7V5

SUPPLY

REFERENCE

SIGNAL

TB2 +

TB3 +

TB2 -

TB3 -

4K75

Isolated PSU

+

-

TB1 A

TB1 B

100R

7V5

SUPPLY

REFERENCE

SIGNAL

TB2 +

TB3 +

TB2 -

TB3 -

4K75

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