8400 StateLine C | Reference manual
System bus "CAN on board"
Communication phases/network management
440 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
10.7.2 Network management telegram (NMT)
The telegram for the network management contains identifier "0" and the command
included in the user data which consists of the command byte and the node address:
[10-4] Network management telegram for changing over the communication phases
The change-over of the communication phases for the entire network is carried out by one
node, the CAN master. The function of the CAN master can also be carried out by the
controller. Parameterising the controller as CAN master
( 441)
Meaning of the node address in the user data:
node ID = "0": The telegram addresses all nodes (broadcast telegram). The status of all
nodes can be changed at the same time.
node ID = "1" ... "127": If a node address is specified, only the status of the node with the
corresponding address changes.
Example:
Data can only be exchanged via process data objects if the status is "Operational".If the
CAN master is supposed to switch all nodes connected to the bus from the "Pre-
Operational" communication status to the "Operational" communication status, the
identifier and user data in the transmission telegram must be set as follows:
Identifier: 0x00 (network management)
User data: 0x0100 ("Start remote node" NMT command to all nodes)
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