Parker
Hannifin
An EPL cycle has two phases, the isochronous and the asynchronous. The
isochronous phase consists of request/response pairs between the MN and
each CN. All periodic data transfer takes place during this portion. See
Figure 42 for details included in this phase.
Using the isochronous time slot procedure to assign the send authorization
avoids data packet collisions on the network, allowing ultra precise timing
(jitter < 1
μ
s).
The asynchronous phase is devoted to other types of communication
between nodes, including standard TCP/IP and UDP. This phase allows non-
EPL related communication to take place during the EPL cycle.
Figure 42 EPL Cycle
EPL Node IDs
Each node on an EPL network has a unique node ID. The MN always has
the ID 240, whereas the CN nodes IDs may be between 1 and 239. It is the
node ID that allows the internal EPL firmware to identify whether a node is an
MN or CN. In general, a node that can be a CN will have external switches to
set the node ID.
NOTE:
Do not confuse the node ID with the axis number in AcroBASIC.
Node IDs start at one, while axis numbers always start at zero.
Appendix H ETHERNET Powerlink 163
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