ABB FEPL-02 Ethernet POWERLINK, Руководство пользователя

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98 Communication protocol
Network Management Services
Ethernet POWERLINK Network Management (NMT) is node-
oriented and follows a master/slave relationship. The adapter
module 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. For more information, see section Ethernet
POWERLINK state machine on page 92 .

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 following NMT
Response Services:
•
NMT State Response
•
IdentResponse
•
StatusResponse.
Via the NMT State Response service, the CNs signal their states to
the MN. The IdentResponse service is used by the MN to identify
configured but unrecognized CNs at system start-up or after loss of
communication. For more information, see Appendix C –
IdentResponse Frame .