Lenze E84AYCEC - Manual (Page 29)

EDS84AYCEC EN 3.0 - 09/2012
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29
E84AYCEC communication manual (Ethernet POWERLINK)
Installation
Electrical installation
5.2.3 Ethernet POWERLINK
In order to use the real-time capability of the Ethernet POWERLINK technology, Ethernet
POWERLINK nodes must be interconnected in a separate network segment.
In accordance with the EPL rules, only the managing node controls the network access of
EPL nodes. The managing node is the only node that transmits autonomously. The slave
nodes (i.e. all controlled nodes) only transmit when they are entitled to transmit by the
managing node.
Non-EPL nodes (e.g. PCs) typically violate these rules by sending frames independently of
the managing node. These frames interfere with the cyclic frame exchange of the EPL
nodes and impede the real-time capability of Ethernet POWERLINK.
Connection to the standard Ethernet network
The connection to an external standard Ethernet network is carried out via an Ethernet
POWERLINK router or an Ethernet POWERLINK gateway.
These infrastructure components separate the network traffic in the Ethernet POWERLINK
network segment from the one in the standard Ethernet. The handling of the frames
depend on their direction:
 Standard Ethernet ---> EPL network segment:
Only frames that are addressed to nodes in the EPL network segment are forwarded.
The forwarding takes place in the asynchronous area of the EPL cycle.
 EPL network segment ---> standard Ethernet:
Only asynchronous frames that are not addressed to nodes in the EPL network segment
are forwarded.

Tip!
Detailed information on the function and setting of the router or gateway can be
found in the documentation of the component manufacturer.

Note!
Standard Ethernet nodes are not permitted in the Ethernet POWERLINK network
segment.