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Terminology
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
Terminology
Term
Abbrevi-
ation
Description
Cable Redundancy Function --- A function to continue communications with Ether-
CAT slaves even if a communications cable is bro-
ken in the EtherCAT communications path.
CAN application protocol over EtherCAT CoE A CAN application protocol service implemented on
EtherCAT.
CAN in Automation CiA CiA is the international users’ and manufacturers’
group that develops and supports higher-layer proto-
cols.
Device Profile --- Collection of device dependent information and func-
tionality providing consistency between similar
devices of the same device type.
Distributed Clocks DC Method to synchronize slaves and maintain a global
time base.
EtherCAT Slave Controller ESC A controller for EtherCAT slave communication.
EtherCAT Slave Information ESI An XML file that contains setting information for an
EtherCAT slave.
EtherCAT State Machine ESM An EtherCAT communication state machine.
EtherCAT Technology Group ETG The ETG is a global organization in which OEM, End
Users and Technology Providers join forces to sup-
port and promote the further technology develop-
ment.
Fieldbus Memory Management Unit FMMU Single element of the fieldbus memory management
unit: one correspondence between a coherent logi-
cal address space and a coherent physical memory
location.
Index --- Address of an object within an application process.
Object --- Abstract representation of a particular component
within a device, which consists of data, parameters,
and methods.
Object Dictionary OD Data structure addressed by Index and Subindex
that contains description of data type objects, com-
munication objects and application objects.
Physical Device Internal Interface PDI A series of elements to access data link services
from the application layer.
Power Drive System PDS A power drive system consisting of a Servo Drive, an
inverter, and other components.
Process Data --- Collection of application objects designated to be
transferred cyclically or acyclically for the purpose of
measurement and control.
Process Data Object PDO Structure described by mapping parameters that
contain one or several process data entities.
Receive PDO RxPDO A process data object received by an EtherCAT
slave.
Ring disconnection status --- A status in which communications continue even if
an EtherCAT physical layer link is disconnected in a
ring topology on the EtherCAT system.
safe state --- The status of a device or piece of equipment when
the risk of danger to humans has been reduced to an
acceptable level.
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