Network management (NMT)
9
Networking via system bus (CAN)
9.3
l
9.3-1
EDSPM-TXXX-3.0-04/2004
9.3 Network management (NMT)
The master can change states for the entire CAN network via the network
management.
Structure of the CAN telegram used for network management:
11 bits 2 bytes of user data
Identifier Command (1 byte) Device address (1 byte)
00
h
Command Network status
after change
Information
01
h
Operational The I/O system can receive parameter data and process data.
02
h
Stopped The I/O system can receive network management telegrams, but is
unable to receive parameter and process data.
80
h
Pre-Operational The I/O system can receive parameter data while process data are
ignored.
81
h
Pre-Operational Reset Node: Changes to system bus parameters relevant to
communication (e.g. node address, baud rate, etc.) are only accepted
after a Reset Node.
Device address Information
0 All nodes are addressed. In this way, a status change can be implemented for all device s at
thesametime.
1 ... 63 Node address of the node the sta tus of which is to be changed.
Command
Device address
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