fieldbus.
Data consistency
Means for coherent transmission and access of the input-or
output-data object between and within Client and Server.
Data exchange
Demand dependent; non cyclic transmission (service channel).
Data type
Relation between values and encoding for data of that type
according to the definitions of IEC 61131-3.
Set of values together with a set of permitted operations.
Data type object
Entry in the object dictionary indicating a data type.
Default gateway
Device with at least two interfaces in two different IP subnets
acting as router for a subnet.
Device
Field device.
Networked independent physical entity of an industrial
automation system capable of performing specified functions
in a particular context and delimited by its interfaces.
Entity that performs control, actuating and/or sensing
functions and interfaces to other such entities within an
automation system.
Physical entity connected to the fieldbus composed of at least
one communication element (the network element) and which
may have a control element and/or a final element
(transducer, actuator, etc.).
Device profile
Collection of device dependent information and functionality
providing consistency between similar devices of the same
device type.
Representation of a device in terms of its parameters and
behaviour according to a device model that describes the
device’s data and behaviour as viewed through a network,
independent from any network technology.
Diagnosis information
All data available at the Server for maintenance purposes.
Distributed clocks
Method to synchronize Slaves and maintain a global time
base.
DL
Data-link-layer.
DLPDU
Data-link-protocol-data-unit.
Drive Object
Functional element of a Drive Unit.
Drive Unit
Logical device which comprises all functional elements related
to one central processing unit.
Error
Discrepancy between a computed, observed or measured value
or condition and the specified or theoretically correct value or
condition.
Error class
General grouping for related error definitions and
corresponding error codes.
Error code
Identification of a specific type of error within an error class.
EtherCAt State Machine
EtherCAT Slave is a state machine; communication and
operating characteristics depend on the current state of the