AKD EtherCAT | 2 General
2.4 Abbreviations Used
Abbreviation Meaning
AL
Application Layer: the protocol that directly used by the process entities.
Cat
Category – classification for cables that is also used in Ethernet.
DC
Distributed Clocks Mechanism to synchronize EtherCAT slaves and master
DL
Data Link(=Layer 2). EtherCAT uses standardized Ethernet (IEEE 802.3)
ESC
EtherCAT Slave Controller
FPGA
Field Programmable Gate Array
FTP
File Transfer Protocol
HW
Hardware
ICMP
Internet Control Message Protocol: Mechanisms for signaling IP errors.
IEC
International Electrotechnical Commission: The international standards
IEEE
Institute of Electrical and Electronics Engineers, Inc.
LLDP
Link Layer Discovery Protocol
MAC
Media Access Control
MII
Media Independent Interface: Standardized interface Ethernet controller <-> routing
equipment.
MDI
Media Dependant Interface: Use of connector Pins and Signaling.
MDI-X
Media Dependant Interface (crossed): Use of connector Pins and Signaling with
crossed lines.
OSI
Open System Interconnect
OUI
Organizationally Unique Identifier – the first 3 Bytes of an Ethernet-Address, that
will be assign to companies or organizations and can be used for protocoll iden-
tifiers as well (e.g. LLDP)
PDI
Physical Device Interface: set of elements that allows access to ESC from the pro-
cess side.
PDO
Process Data Object
PDU
Protocol Data Unit: Contains protocol information transferred from a protocol
instance of transparent data to a subordinate level
PHY
Physical interface that converts data from the Ethernet controller to electric or
optical signals.
PLL
Phase Locked Loop
PTP
Precision Time Protocol in accordance with IEEE 1588
RSTP
Rapid Spanning Tree Protocol
RT
Real-time, can be run in Ethernet controllers without special support.
RX
Receive
RXPDO
Receive PDO
SNMP
Simple Network Management Protocol
SPI
Serial Peripheral Interface
Src Addr
Source Address: Source address of a message.
STP
Shielded Twisted Pair
TCP
Transmission Control Protocol
TX
Transmit
TXPDO
Transmit PDO
UDP
User Datagram Protocol: Non-secure multicast/broadcast frame.
UTP
Unshielded Twisted Pair
ZA ECAT
Access mode EtherCAT
ZA Drive
Acces mode drive
10
Kollmorgen | kdn.kollmorgen.com | October 2017
