IF55 ROT CANopen®
NOTE
Please refer to the “7 - Setting-up” section on page 81 for an example of how
the states are to be set.
6.3 Communication objects
Four different kinds of communication messages are used in a CANopen®
network:
Network management NMT protocol: NMT protocols are used by the Master
to manage the nodes and the network, issue the state machine change
commands (i.e. to start and stop the devices), detect the remote device
boot-ups and the error conditions.
Process Data Objects PDO protocol: used to process real time data
(transmission of process data in real time).
Service Data Objects SDO protocol: used to set and read values from the
“Object dictionary” of a remote device.
Special function Objects:
- SYNC: synchronization message used by the Master to enable the Slave
devices to transmit process data (encoder position information).
- Emergency: error messages are triggered by each error event.
- Node Guarding: used to request the state of the Slave; the NMT Master
checks the NMT Slaves at regular intervals.
Relation between the device states and the communication objects:
Initial.
Pre-oper.
Operat.
Stopped
NMT
X
X
X
PDO
X
SDO
X
X
SYNC
X
EMCY
X
X
Boot-up
X
Node guarding
X
X
X
6.3.1 Pre-defined connection set
Master
Slave broadcast
Type of COB
(Object)
Function code
(binary)
COB-ID (hex)
NMT
0000
000
SYNC
0001
080
peer-to-peer transmission
EMERGENCY
0001
081 - 0FF
PDO 1 (tx)
0011
181 - 1FF
PDO 2 (tx)
0101
281 - 2FF
MAN IF55 ROT CB E 1.2.odt
6 - CANopen® interface (DS 406)
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Содержание IF55 ROT CB
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