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SI-Ethernet User Guide
209
Issue: 3
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Implicit data:
See
Cyclic data
.
Instance:
A collection of properties (
Attributes
) that are contained within a
Class
.
Used in conjunction with the
Class
and
Attribute
properties.
IP:
Internet Protocol, this is the protocol used to transmit bytes across an IP network.
IP address:
An address that identifies a node uniquely on a subnet or network.
IP subnet:
A part of an IP network that consists of a range of addresses that may be accessed by
all devices on the same network directly.
LED:
Light Emmiting Diode.
Long word:
A 32 bit data word that may be signed or unsigned.
LSB:
Least Significant Bit/Byte.
MAC address:
This is a unique address that is assigned to the Ethernet interface at the time of
manufacture. No other device will have this address. The address is used to make connections to
the interface before the IP address is assigned.
MBAP:
Modbus application protocol. This is a 7 byte header added to the main Modbus telegram
(PDU) which contains IP specific identifiers.
Modbus IP:
A protocol that allows Modbus to be sent over TCP/IP. The modbus protocol allows
manipulation of the parameters within the host drive and option modules.
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-crossover lead:
See
Patch lead
.
Non-cyclic (explicit) data:
Data that is requested or sent as required and not on a regular basis.
Sometimes referred to as “Explicit data”.
Octet:
A collection of 8 binary digits which form a byte.
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