EM58 • HS58 • HM58 POWERLINK
The MN starts the asynchronous phase with the SoA. The SoA is used to identify
CNs, request status information of a CN, to poll async-only CNs and to grant the
asynchronous transmit right to one CN.
The SoA frame is the first frame in the asynchronous phase and is a signal to all
CNs that all isochronous data have been exchanged during the isochronous
phase.
The asynchronous phase is calculated from the start of SoA to the end of the
asynchronous response. If no asynchronous response is allowed for any node,
the asynchronous phase is terminated by the end of SoA.
6.8.3 Idle Period
After both the SoA and the acyclic frames have been transmitted, the Idle Period
is entered. All the nodes wait for the new cycle to start, i.e. to receive a new SoC
frame from the MN.
6.9 CN Node NMT States
After the Initialization NMT State Machine (it is common to both MN and CNs),
the POWERLINK devices enter specific MN and CN states.
Here follows the list of the available CN states.
Figure 32 - CN NMT State Machine
MAN EM58_HS58_HM58 PL E 1.1.odt
POWERLINK interface
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