
3 Protocol description
15-04-2016 17 7000.05052
3.3.1.2
Writing to the object dictionary
Entries in the object dictionary can be written using the SDO Write. Telegrams are always
acknowledged.
Tab. 5: Request
Byte
Contents
Description
1
Length
User data length >7 bytes
2
Node number
Node number
3
0x02
Command SDO Write
4
Index LB
Index of the object entry LB
5
Index HB
Index of the object entry HB
6
Sub-index
Sub-index of the object entry
7–N
Value
New value for the specified object entry
(N+1)
CRC
Check sum
Tab. 6: Response
Byte
Contents
Description
1
7
User data length 7 bytes
2
Node number
Node number
3
0x02
Command SDO Write
4
Index LB
Index of the object entry LB
5
Index HB
Index of the object entry HB
6
Sub-index
Sub-index of the object entry
7
CRC
Check sum
If the specified object cannot be read, the response is an SDO error in accordance with
CiA301 (see chap. 3.3.3, p. 23).