SI-EtherCAT User Guide
101
Issue Number: 2
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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.
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.
Grounding / Earthing:
Describes the electrical safety or shielding connections for the
module.
LED:
Light emitting 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
.
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