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Communication profiles

The ODVA AC/DC Drive Profiles

This section briefly describes the ODVA AC/DC Drive Profiles.

Additional information can be obtained from www.odva.org

A DeviceNet node is modeled as a collection of abstract objects.

Each object represents the interface to and behavior of a

component within the product. The ODVA AC/DC Drive Profiles

define a collection of objects suitable for the control of AC and DC

drives. Objects supported by the FDNA-01 DeviceNet Adapter are

listed in Communications – Class Objects.

Objects are defined by:

• Service

• Class

•Instance

• Attribute

• Behavior

For example, to set the drive speed reference, the

Set_Attribute_Single service can be requested for Attribute

SpeedRef of the Class AC/DC Drive Object. The resulting

behavior is that the reference speed of the drive is set to the

requested value.

This is an example of Explicit Messaging where each attribute of a

class is set individually. While this is allowed, it is inefficient.

Instead Implicit Messaging using Input and Output Assembly

Instances is recommended. Implicit Messaging allows the

DeviceNet Master to set or get predefined groups of attributes in a

single message exchange. Assembly Instances supported by the

FDNA-01 are listed and defined in Communications – Assembly

Objects.

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ABB FDNA-01 Bedienungsanleitung Seite 43