BECKHOFF EtherCAT Technology Section I - Manual (Page 13)

ABBREVIATIONS
Slave Controller – Technology I-XIII
ABBREVIATIONS
µC
Microcontroller
ADR Address
ADS Automation Device Specification (Beckhoff)
AL Application Layer
AMBA ® Advanced Microcontroller Bus Architecture from ARM ®
APRD Auto Increment Physical Read
APWR Auto Increment Physical Write
APRW Auto Increment Physical ReadWrite
ARMW Auto Increment Physical Read Multiple Write
AoE ADS over EtherCAT
ASIC Application Specific Integrated Chip
Auto Crossover Automatic detection of whether or not the send and receive lines are crossed.
Auto Negotiation Automatic negotiation of transmission speeds between two stations.
Avalon ® On-chip bus for Altera ® FPGAs
AXI TM Advanced eXtensible Interface Bus, an AMBA interconnect. Used as On-Chip-
bus
Big Endian Data format (also Motorola format). The more significant byte is transferred first
when a word is transferred. However, for EtherCAT the least significant bit is
the first on the wire.
BOOT BOOT state of EtherCAT state machine
Boundary Clock A station that is synchronized by another station and then passes this
information on.
Bridge A term for switches used in standards. Bridges are devices that pass on
messages based on address information.
Broadcast An unacknowledged transmission to an unspecified number of receivers.
BRD Broadcast Read
BWR Broadcast Write
BRW Broadcast ReadWrite
Cat Category – classification for cables that is also used in Ethernet. Cat 5 is the
minimum required category for EtherCAT. However, Cat 6 and Cat 7 cables are
available.
CoE CAN ® application layer over EtherCAT
Communication
Stack A communication software package that is generally divided into successive
layers, which is why it is referred to as a stack.
Confirmed Means that the initiator of a service receives a response.
CRC Cyclic Redundancy Check, used for FCS