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Chapter 6 – Communication
6-12
NCAN-02 Installation and Start-up Guide
Service Data Objects
(SDO)
Service Data Objects are mainly used for transferring non-time-critical
data, e.g. parameter values. SDOs provide access to the entries in the
device Object Dictionary.
If 4 bytes or less data is to be transmitted, an ‘expedited’ SDO
message can be used. Larger quantities of data can be segmented, i.e.
split between several CAN messages.
The COB IDs for SDO communication are:
• Master to Slave: 600h + Node ID
• Slave to Master: 580h + Node ID.
Read:
Write:
Master to Slave
Header
Byte
1
2
3
4
5
6
7
8
1100xxxxxxx01000
Command
Object Index
Sub-
index
Reserved
xxxxxxx = Node ID
Master to Slave
(‘Expedited’ message with max. 4 bytes of data)
Header
Byte
1
2
3
4
5
6
7
8
1100xxxxxxx01000
Command
Object Index
Sub-
index
Data
Master to Slave
(Segmented message with over 4 bytes of data)
1st Frame
Header
Byte
1
2
3
4
5
6
7
8
1100xxxxxxx01000
Command
Object Index
Sub-
index
Length
All Subsequent Frames
Header
Byte
1
2
3
4
5
6
7
8
1100xxxxxxx01000
Command
Data
Содержание NCAN-02
Страница 1: ...ABB Drives Installation and Start up Guide CANopen Adapter Module NCAN 02 ...
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Страница 9: ...Table of Contents NCAN 02 Installation and Start up Guide iii Ambient Conditions Transportation 10 1 ...
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Страница 14: ...Chapter 1 Introduction to This Guide 1 4 NCAN 02 Installation and Start up Guide ...
Страница 18: ...Chapter 2 Overview 2 4 NCAN 02 Installation and Start up Guide ...
Страница 32: ...Chapter 5 Programming 5 6 NCAN 02 Installation and Start up Guide ...
Страница 54: ...Chapter 6 Communication 6 22 NCAN 02 Installation and Start up Guide ...
Страница 56: ...Chapter 7 Diagnostics 7 2 NCAN 02 Installation and Start up Guide ...
Страница 70: ...Appendix B Technical Data B 4 NCAN 02 Installation and Start up Guide ...
Страница 72: ...Appendix C Ambient Conditions C 2 NCAN 02 Installation and Start up Guide ...
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