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3
CANopen access procedure
40
Festo – GDCP-CMMP-M3/-M0-C-CO-EN – 1510b – English
Transition
Significance
CS
Target status
2
Bootup
--
Pre-Operational
7F
h
3
Start Remote Node
01
h
Operational
05
h
4
Enter Pre-Operational
80
h
Pre-Operational
7F
h
5
Stop Remote Node
02
h
Stopped
04
h
6
Start Remote Node
01
h
Operational
05
h
7
Enter Pre-Operational
80
h
Pre-Operational
7F
h
8
Stop Remote Node
02
h
Stopped
04
h
9
Reset Communication
82
h
10
Reset Communication
82
h
11
Reset Communication
82
h
12
Reset Application
81
h
Reset Application
13
Reset Application
81
h
Reset Application
14
Reset Application
81
h
Reset Application
1)
The final target status is pre-operational (7F
h
), since the transitions 15 and 2 are automatically performed by the controller.
Tab. 3.10
NMT state machine
All other status transitions are performed automatically by the controller, e.g. because the initialisation
is completed.
In the NI parameter, the node number of the controller must be specified or zero if all nodes in the net
work are to be addressed (broadcast). Depending on the NMT status, certain communication objects
cannot be used: For example, it is absolutely necessary to place the NMT status to operational so that
the controller sends PDOs.
Name
Significance
SDO
PDO
NMT
Reset
Application
No Communication. All CAN objects are reset to their reset
values (application parameter set)
–
–
–
Reset
Communication
No communication: The CAN controller is newly initialised.
–
–
–
Initialising
Status after hardware reset. Resetting of the CAN node,
Sending of the bootup message
–
–
–
Pre-Operational
Communication via SDOs possible; PDOs not active (no
sending/evaluating)
X
–
X
Operational
Communication via SDOs possible; all PDOs active (send
ing/evaluating)
X
X
X
Stopped
No communication except for heartbeating
–
–
X
Tab. 3.11
NMT state machine