SM-Ethernet User Guide
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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.
Assembly object:
A software component within the SM-Ethernet 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.
ADU:
Application Data Unit. The complete Modbus message frame (ADU) consists of
the Modbus Application Protocol (MBAP) and Protocol Data Unit (PDU).
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”.
Data rate:
Determines the communication speed of the network, the higher the value
the more data can be sent across the network in the same time period.
Device:
A piece of equipment connected to a network, this may be any type of
equipment including repeaters, hubs, masters or slaves.
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