Overview
9
Overview
What this chapter contains
This chapter contains a short description of the Ethernet
POWERLINK protocol and the REPL-01 Ethernet POWERLINK
Adapter module, a delivery checklist and warranty information.
Ethernet POWERLINK
Ethernet POWERLINK is a communication profile for Real Time
Ethernet. It extends standard Ethernet IEEE802.3 with a
mechanism to transfer data deterministically. The mechanism is
called Slot Communication Network Management (SCNM). SCNM
is managed by a networked device designated as the Managing
Node (MN). All other nodes are Controlled Nodes (CN). The
REPL-01 is capable of participating in an Ethernet POWERLINK
network as a CN.
Unlike standard Ethernet, SCNM ensures that only one node is
accessing the network at a time. The schedule is divided into an
isochronous phase and an asynchronous phase. During the
isochronous phase, time-critical data is transfered, while the
asynchronous phase provides bandwidth for the transmission of
data that is not time-critical. The MN grants access to the physical
medium via dedicated poll request messages. As a result, only
one CN has access to the network at a time, and thus no collisions
occur.
Ethernet POWERLINK applies the same protocol technology as
CANopen. It defines SDOs (Service Data Objects), PDOs
(Process Data Objects) and the Object Dictionary structure to
manage the parameters.
Further information is available from the Ethernet POWERLINK
Standardization Group (
www.ethernet-powerlink.org
).
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
