Rockwell-automation T80004 Application Note Field Loop Configuration Manual do Utilizador descarregar pdf (Página 31)

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AN-T80004 Field Loop Configuration

Issue 10 Jun 13 AN-T80004 31

It is advised to add load resistors to loads under about 20 to 25mA to increase them above the

minimum threshold. It is also possible to apply a threshold of 3mA to a group, but only if the group has

entirely light loads; this setting will otherwise clearly increase the chances of noise causing a false

positive diagnosis, causing a potential shutdown.

Quad Structure Modules 8472, 8473

These modules do not have the triplicated output circuit described above. Instead, they have a quad

arrangement of switches. The no-load threshold applies to the entire load current, so a threshold of

20mA allows a minimum load of 20mA. The default is 10mA on older 8472s and 20mA on newer

8472s and on 8473s, as shown in the specifications in the product descriptions.

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Rockwell-automation T80004 Application Note Field Loop Configuration Manual do Utilizador Página 31