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6
CANopen DEFINITIONS
6.1
Communication
method
There are two objects for CANopen data communication objects: Process Data Object (PDO) and Service
Data Object (SDO).
PDO has features such as transmission of real time data and no response (Ack) requirement, and can be
used for general process data transmission. SDO has features such as peer to peer communication and cor-
rect communication by response waiting and can handle a large amount of data. Therefore it is used for set-
ting change and diagnosis of device.
Device model of CANopen communication is indicated below.
Refer to a CANopen standard material for details.
CANopen Protocol
PDO
SDO
Error control
NMT
Object dictionary
Index Description
1000h
1001h
1018h
Device type
Application
CAN
I/O
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A7NCA.book 36 ページ 2006年7月3日 月曜日 午前9時48分