Beckhoff EtherCAT Technology Section I Bedienungsanleitung PDF herunterladen (Seite 18)

ABBREVIATIONS

I-XVIII Slave Controller – Technology

RJ45

FCC Registered Jack, standard Ethernet connector (8P8C)

RMII

Reduced Media Independent Interface

Router

Network component acting as a gateway based on the interpretation of the IP

address.

RSTP

Rapid Spanning Tree Protocol: Prevents packet from looping infinitely between

switches; RSTP is specified in IEEE 802.1 D (Edition 2004)

Real-time. Name for a real-time protocol that can be run in Ethernet controllers

without special support.

RTC

Real-time Clock chip of PCs

RT Frames

EtherCAT Messages with EtherType 0x88A4.

Receive

RXPDO

Receive PDO, i.e. Process Data that will be received by ESC20

RUN

RUN indicator (LED) for application state

SAFEOP

Safe-Operational state of EtherCAT state machine

Safety

Safety function, implemented by an electric, electronic programmable fail-safe

system that maintains the equipment in a safe state, even during certain critical

external events.

Schedule

Determines what should be transferred and when.

Services

Interaction between two components to fulfill a specific task.

Set

Access method used by a client to write data to a server.

SII

Slave Information Interface

SyncManager

SNMP

Simple Network Management Protocol: SNMP is the standard Internet protocol

for management and diagnostics of network components (see also RFC 1157

and RFC 1156 at www.ietf.org ).

SoE

Servo Profile over EtherCAT

SOF

Start of Frame

Ethernet SOF delimiter at the end of the preamble of Ethernet frames

SPI

Serial Peripheral Interface

Src Addr

Source Address: Source address of a message.

Store and

Forward

Currently the common operating mode in switches. Frames are first received in

their entirety, the addresses are evaluated, and then they are forwarded. This

result in considerable delays, but guarantees that defective frames are not

forwarded, causing an unnecessary increase in the bus load.

STP

Shielded Twisted Pair: Shielded cable with at least 2 core pairs to be used as

the standard EtherCAT cable.

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