Lenze EMF2191IB - Manual (Page 26)

Installation
Electrical installation
POWERLINK
5
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26 EDSMF2191IB EN 2.0
5.2.3 POWERLINK
POWERLINK network segment
)
Note!
Standard Ethernet nodes are not permitted in the POWERLINK network
segment.
In order to use the real−time capability of the POWERLINK technology, the POWERLINK
nodes must be interconnected in a separate network segment.
In accordance with the POWERLINK rules, only the network master (managing node)
controls the access of the slaves (controlled nodes) to the network. The network master is
the only node that transmits autonomously. All other nodes (controlled nodes) only
transmit when they are entitled to transmit by the master.
Non−POWERLINK nodes (e.g. PCs) typically violate these rules by sending frames
independently of the master. These frames interfere with the cyclic frame exchange of the
POWERLINK nodes and prevent the real−time capability of the POWERLINK.
Connection to the standard Ethernet network
The connection to an external standard Ethernet network is carried out via an Ethernet
POWERLINK router.
These infrastructure component separates the network traffic in the POWERLINK network
segment from the one in the standard Ethernet. The handling of the frames depend on
their direction:
ƒ Standard Ethernet −−−> POWERLINK network segment
Only frames that are addressed to nodes in the POWERLINK network segment are
forwarded. The forwarding takes place in the asynchronous area of the POWERLINK
cycle.
ƒ POWERLINK network segment −−−> Standard Ethernet
Only asynchronous frames that are not addressed to nodes in the POWERLINK network
segment are forwarded.