SI-Ethernet User Guide 207
Issue: 3
Safety
information
Introduction
Mechanical
installation
Electrical
installation
Getting started Parameters
Key features
and Protocols
PC Tools
Applications
Security Diagnostics
Glossary of
terms
Index
11 Glossary of terms
Address: This is the unique network identification given to a networked device to allow
communication on a network. When a device sends or receives data the address is used to
determine the source and the destination of the message.
ADU: Application Data Unit. The complete Modbus message frame (ADU) consists of the Modbus
Application Protocol (MBAP) and Protocol Data Unit (PDU).
Assembly object: A software component within the Ethernet interface which allows access to the
parameters within the drive or which allows control and monitoring of the drive by using the
EtherNet/IP protocol.
Attribute: A sub-division of a Class which uniquely identifies a specific command.
e.g. The VendorID is an attribute of the Identity object class.
Used in conjunction with the Class and Instance properties.
Auto-crossover detection: A method used to automatically detect if a crossover or non-crossover
network cable is connected.
Bit: A binary digit, this may have the value of 1 or 0.
Byte: A collection of 8 binary digits that collectively store a value. This may be signed or unsigned.
Class: A collection of properties which allow the control or monitoring of a device. Used in
conjunction with the Instance and Attribute properties.
Consistency: A method of ensuring that the data transferred over the network is transmitted as a
single entity, thus preventing data skew when multiple bytes are transmitted.
Control word: A collection of binary digits that are used to control the drive. Features typically
include directional controls, run controls and other similar functions.
Crossover lead: A network cable where the terminal connections at one end of the cable are
connected straight through to the other end with the exception of the data pair which are
transposed. Normally used to connect two network devices together as a separate network.
Cyclic (implicit or polled) data: Data that is transmitted at regular intervals over the network.
Sometimes referred to as “Implicit data” or “Polled data”.
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