Communication
55
EtherNet/IP
Overview
This chapter describes the Ethernet/IP communication protocol for
RETA-01. For detailed information on Ethernet/IP communication,
refer to ODVA Ethernet/IP specifications Release 1.0.
Introduction to Ethernet/IP
Ethernet/IP is a protocol based on Common Industrial Protocol
(CIP) technology, which is also the framework for both DeviceNet
and ControlNet. Ethernet/IP specifies the wiring, and the data
transfer through the bus.
The RETA-01 module can act as a server on an EtherNet/IP
network.
Object modelling and functional profiles
One of the main features of EtherNet/IP is object modelling.
EtherNet/IP requires mandatory objects specified by ODVA in
addition to some vendor-specific objects. A group of objects can
be described with a Functional Profile. The RETA-01 realizes the
ODVA AC/DC Drive Functional Profile with additional features.
Assembly objects
I/O Assembly Instances may be referred to as Block Transfer of
data. Intelligent devices realizing a Functional Profile, such as the
RETA-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 using the Assembly object.
The Assembly object acts as a tool for grouping these attributes.
The RETA-01 uses static assemblies (in other words, fixed set of
object data), except for the User Specific Control assembly, where
user can select the I/O parameters.
The module has two communication profiles as represented
above, AC/DC drive profile and ABB Drives profile.
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