Cycle State Machine
The Cycle State Machine controls the POWERLINK cycle on the
Data Link Layer and is itself controlled by the NMT state
machine defining the current operating mode.
Cycle Time
The time between two consecutive Start of Cyclic (SoC) frames
– i.e. repeating – process. The Cycle Time includes the time for
data transmission and some idle time before the beginning of
the next cycle. Refer also to page 51.
Destination NAT (D-NAT)
D-NAT (Destination- Network Address Translation) changes
the destination address of the IP / ICMP packet.
Determinism
Determinism means that a system responds in a predictable
(deterministic) manner.
Deterministic
Communication
It describes a communication process whose timing behaviour
can be predicted exactly. I.e. the time when a message reaches
the recipient is predictable. Refer to page 65.
Device Configuration File
The configuration parameters of a specific device are stored in
the Device Configuration File (XDC).
Device Description File
All device dependent information is stored in the Device
Description File (XDD) of each device. Refer to page 69.
Domain
In the context of CANopen: A Domain is a data object of
arbitrary type and length which can be transferred over a
POWERLINK network. In the context of internet protocols: A
Domain is a part of the internet name space which is
supported by the Domain Name System (DNS).
Encoder Profile
POWERLINK integrates with CANopen Profiles “DS301
CANopen Application Layer and Communication Profile” and
“DS406 Device Profile for Encoders” for device interoperability.
The “DS406 Device Profile for Encoders” is intended to define a
standard application interface for encoders. The profile is a
supplement to the “DS301 CANopen Application Layer and
Communication Profile”, so it is mandatory to read the DS301
profile before implementing the encoder profile. POWERLINK
encoders from Lika Electronic comply with the “EPSG Draft
Standard 301 Ethernet POWERLINK Communication Profile
Specification Version 1.2.0”. See also “Profile”. Refer to page
63.
Ethernet POWERLINK
(EPL)
An extension to Legacy Ethernet on layer 2, to exchange data
under hard real-time constraints. It was developed for
deterministic data exchange, short cycle time and isochronous
operation in industrial automation.
IdentRequest
IdentRequests are POWERLINK frames sent by the MN in order
to identify active CNs waiting to be included into the network.
IdentResponse
The IdentResponse is a special form of an ASnd frame in
response to an IdentRequest.
Idle Period
The Idle Period is time interval remaining between the
completed asynchronous period and the beginning of the next
cycle. Refer also to page 66.
