Network Management Services - JVL MAC00-EC41 User Manual

5.5

Network Management Services

Ethernet POWERLINK Network Management (NMT) is node oriented and follows a
master/slave relationship.
The MAC00-ELx or MIS/MILxxxxxxELxxxxx is administered as an NMT slave by the
master. Ethernet POWERLINK defines five categories of NMT services:
• NMT State Command Services
• NMT Managing Command Services (not supported)
• NMT Response Services
• NMT Info Services (not supported)
• NMT Guard Services (not supported)
NMT State Command Services
The MN controls the state of the CN via NMT State Command Services. See section
Ethernet POWERLINK state machine for more information.
NMT Response Services
NMT Response Services are used by the MN to query NMT information from the CN,
such as current state, error and setup data. Ethernet POWERLINK specifies the follow-
ing NMT Response Services:
• NMT State Response
• IdentResponse
• StatusResponse
Via NMT State Response service, the CNs signals their states to the MN. IdentResponse
Service is used by the MN to identify configured but unrecognized CNs at system start-
up or after loss of communication. See Appendix: IdentResponse Frame for more infor-
mation. The StatusResponse Service is used by the MN to query the current status of
CNs that is not communicating isochronously. It is used for error signaling in runtime. If
an error occurs, the EN (Error New) flag in the PRes frame is toggled. This notifies the
MN that an error has occurred and the MN polls the CN for a StatusResponse that in-
cludes error information.
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