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SM-EtherCAT User Guide 65
Issue Number: 2 www.controltechniques.com
Safety
Information
Introduction
Mechanical
Installation
Electrical
Installation
Getting
Started
Protocols
Drive profile (DSP-402)
support
Advanced
features
Diagnostics
Quick
Reference
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.
Bit: A binary digit, this may have the value of 1 or 0.
Byte: A collection of eight binary digits that collectively store a value. This may be
signed or unsigned.
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.
Cyclic: Data that is transmitted at regular intervals over the network.
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.
Double word: A 32-bit word, this may be signed or unsigned.
Earthing / Grounding: Describes the electrical safety or shielding connections for the
module.
LED: Light emmiting diode.
Long word: A 32-bit data word that may be signed or unsigned.
LSB: Least significant bit/byte.
MSB: Most significant bit/byte.
Node: A device on the network. This may be either a device such as a drive or part of
the network such as a repeater.
Non-cyclic data: Data that is requested or sent as required and not on a regular basis.
Octet: A collection of eight binary digits which form a byte.
PC: Personal computer.
PLC: Programmable logic controller.
Poll rate: The rate at which cyclic data is sent and received on the network.
Polled data: See Cyclic data.