ABB FDNA-01 Manual de usuario descargar pdf (Pagina 57)

Communication

Overview

This chapter describes the DeviceNet communication protocol for

the FDNA-01 and the configuration of the scanner. For detailed

information on DeviceNet communication, refer to ODVA

DeviceNet Specifications Release 2.0.

Introduction to DeviceNet

DeviceNet is a protocol based on CAN technology. CAN specifies

the physical layer interface. DeviceNet specifies the wiring, and

the data transfer through CAN.

The FDNA-01 is a device acting as a Group 2 only Server

realizing the Predefined Master Slave Connection Set

functionality. The Off-line Connection Set functionality and UCMM

are not supported.

Object modeling and functional profiles

One of the main features of DeviceNet is object modeling. A group

of objects can be described with a Functional Profile. The FDNA-

01 realizes the ODVA AC/DC Drive Functional Profile with

additional features.

Assembly objects

I/O Assembly Instances may also be referred to as Block Transfer

of data. Intelligent devices realizing a Functional Profile, such as

the FDNA-01, have several objects. Since it is not possible to

transmit more than one object data through a single connection, it

is practical and more efficient to group attributes from different

objects into a single I/O connection (for example a Polled

Connection) using the Assembly object. The Assembly object acts

as a tool for grouping these attributes.

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ABB FDNA-01 Manual de usuario Pagina 57