PollRequest
A PollRequest is a frame, which is used in the isochronous part
of the cyclic communication. The MN request with this frame
the CN to send its data. Refer to page 64.
PollResponse
A PollResponse is a frame, which is used in the isochronous
part of the cyclic communication. The CN responses with this
frame to a PollRequest frame from an MN. Refer to page 64.
POWERLINK Command
Layer
The POWERLINK Command Layer defines commands to access
parameters of the object dictionary. This layer is on top of the
Sequence Layer and distinguishes between an expedited and a
segmented transfer.
POWERLINK Cycle
Data exchange within a POWERLINK network is structured in
fix intervals, called cycles. The cycle is subdivided into the
isochronous and the asynchronous period and is organized by
the MN. Refer to page 65.
POWERLINK Mode
The POWERLINK Mode includes all NMT states in which
POWERLINK cycles are run. Refer to page 66.
POWERLINK Node ID
Each POWERLINK node (MN, CN and Router) is addressed by
an 8 bit POWERLINK Node ID on the POWERLINK layer. This ID
has only local significance (i.e. it is unique within a
POWERLINK segment). Refer to page 32.
Precision Time Protocol
(PTP)
IEEE 1588, Standard for a Precision Clock Synchronisation
Protocol for Networked Measurement and Control Systems.
Process Data Object
(PDO)
Object for isochronous data exchange between POWERLINK
nodes.
Profile
Profiles define application-specific functionality to ensure the
openness of POWERLINK is utilized consistently. Profiles can
cover simple devices such as encoders by defining how signals
are used and how they are physically connected. However,
profiles are increasingly covered more complex systems or
requirements. Profiles guarantee quicker system design and
they support faster device interchange, promoting
competition amongst vendors, increased choice for users and
full interoperability. POWERLINK encoders from Lika Electronic
comply with the “EPSG Draft Standard 301 Ethernet
POWERLINK Communication Profile Specification Version
1.2.0”. See also “Encoder profile”. See on page 61.
Real-time
Real-time means that a system processes external events
within a defined time. If the reaction of a system is
predictable, one speaks of a deterministic system. The general
requirements for real-time are therefore: deterministic
response and defined response time. Refer to page 65.
Reserved
Reserved bits shall be set 0 by the sender. The receiver shall
not interpret such bits. It is not allowed to use reserved bits.
Their use is reserved for further development or by extensions
of this specification.
Router Type 1
A Type 1 POWERLINK Router is a coupling element in a