www.balluff.com
18
•
After a CANopen node is switched on and the communication and the internal
application is initialised, the node switches into pre-operational state. From this
state the NMT-Master can switch the node into the other states. To show that a
node is ready after boot up, it sends a "boot-up message". These messages uses
the CAN-ID of the Emergency service (EMCY).
The message is permanently associated with the node ID.
Description of the NMT-states:
Pre-Operational
Object
Communication enabled
SDO
yes
PDO
no
NMT
yes
SYNC
no
EMCY
yes
Heartbeat
yes
SDO communication is enabled.
PDO communication is disabled.
Table 5.4: Available communication
– Pre-Operational
Operational
Object
Communication enabled
SDO
yes
PDO
yes
NMT
yes
SYNC
yes
EMCY
yes
Heartbeat
yes
Device is in operational status and can send and receive PDOs.
Table 5.5: Available communication
– Operational
Stopped
Object
Communication enabled
SDO
no
PDO
no
NMT
yes
SYNC
no
EMCY
no
Heartbeat
yes
The communication is almost completely disabled.
The device only reacts on NMT commands (e.g. start node).
Table 5.6: Available communication
– Stopped
5.5
Heartbeat and Node - Gua rding
There are two possible ways to supervise the operational availability of a CAN node during operation.
•
Heartbeat
•
Node-Guarding
The heartbeat protocol is independent from the master. It is the recommended mechanism. The device sends
autonomous and cyclic a "life" message.
Содержание BDG F-NH Series
Страница 1: ...deutsch Konfigurationsanleitung english Configuration guide BDG F_ _ _ _ _ _ _ _ NH NV...
Страница 2: ...www balluff com...
Страница 3: ...deutsch Konfigurationsanleitung BDG F_ _ _ _ _ _ _ _ NH NV...
Страница 4: ...www balluff com...
Страница 67: ...english Configuration guide BDG F_ _ _ _ _ _ _ _ NH NV...
Страница 68: ...www balluff com...
Страница 105: ...www balluff com 38...
Страница 129: ......