Lenze EMF2178IB - Manual (Page 46)

Data transfer
CAN communication phases / network management (NMT)
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46 EDSMF2178IB EN 3.0
Network management (NMT)
The telegram structure used for the network management contains the identifier and the
command included in the user data which consists of the command byte and the node
address.
Telegrams with the identifier "0" and 2 byte user data are used to change between the
different communication phases.
Identifier User data
Value = 0
11 bits
Only contains command
2 bytes
Fig. 8−2 Telegram for switching over the communication phases
A bus node, the network master, carries out the changes between the communication
phases for the whole network.
With code C1852 / C2352 ( ¶ 125) you can set up the communication module for master
or slave operation.
After an adjustable boot−up time in C1856/1 / C2356/1 in master operation, (
¶ 130) the
NMT command Start_Remote_Node is transmitted, which puts all nodes into the
"Operational" status.
)
Note!
Only a change to "Operational" status enables communication via the process
data!
Example:
If all nodes connected to the bus are to be switched from the
"Pre−Operational" communication status to the "Operational" communication
status via the CAN master, the identifier and the user data must have the
following values in the transmission telegram:
ƒ Identifier: 0x00 (broadcast telegram)
ƒ User data: 0x0100