BECKHOFF EtherCAT Technology Section I User Manual
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ABBREVIATIONS
I-XIV
Slave Controller
– Technology
Cut Through
Procedure for cutting directly through an Ethernet frame by a switch before the
complete message is received.
Cycle
Cycle in which data is to be exchanged in a system operating on a periodical
basis.
DC
Distributed Clocks
Mechanism to synchronize EtherCAT slaves and master
Delay
Delays can be caused by run-times during transfer or internal delays of a
network component.
Dest Addr
Destination address of a message (the destination can be an individual network
station or a group (multicast).
DHCP
Dynamic Host Configuration Protocol, used to assign IP addresses (and other
important startup parameter in the Internet context).
DL
Data Link Layer, also known as Layer 2. EtherCAT uses the Data Link Layer of
Ethernet, which is standardized as IEEE 802.3.
DNS
Domain Name Service, a protocol for domain name to IP addresses resolution.
EBUS
Based on LVDS (Low Voltage Differential Signaling) standard specified in
ANSI/TIA/EIA-644-1995
ECAT
EtherCAT
EEPROM
Electrically Erasable Programmable Read Only Memory. Non-volatile memory
used to store EtherCAT Slave Information (ESI). Connected to the SII.
EMC
Electromagnetic Compatibility, describes the robustness of a device with regard
to electrical interference from the environment.
EMI
Electromagnetic Interference
Engineering
Here: All applications required to configure and program a machine.
EoE
Ethernet over EtherCAT
EOF
End of Frame
ERR
Error indicator for AL state
Err(x)
Physical Layer RX Error LED for debugging purposes
ESC
EtherCAT Slave Controller
ESI
EtherCAT Slave Information, stored in SII EEPROM
ESM
EtherCAT State Machine
ETG
EtherCAT Technology Group
EtherCAT
Real-time Standard for Industrial Ethernet Control Automation Technology
(Ethernet for Control Automation Technology)
EtherType
Identification of an Ethernet frame with a 16-bit number assigned by IEEE. For
example, IP uses EtherType 0x0800 (hexadecimal) and the EtherCAT protocol
uses 0x88A4.