JVL Industri Elektronik A/S - User Manual - Ethernet for MAC and MIS motors 115
5.1 Introduction to POWERLINK
Unlike standard Ethernet, the Slot Communication Network Management (SCNM) en-
sures 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 transferred, while the asynchronous phase provides bandwidth for the
transmission of data that is not time-critical. The Managing Node (MN) grants access to
the physical medium via dedicated poll request messages. As a result, only one Con
-
trolled Node (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.
For general technical data please see Powerlink for MAC or MIS - Technical specifications,
page 259.
Ethernet hub
Legacy ethernet
EPL Router
(Gateway)
MN CN
CNCN
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