
3 Protocol description
15-04-2016 22 7000.05052
Tab. 15: Response SDO Initiate Block Download (Slave to Master)
Byte
Contents
Description
1
7
User data length 7 bytes
2
Node number
Node number
3
0x0B
Command SDO Block Write Init
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
Tab. 16: Request SDO Block Download (Master to Slave)
Byte
Contents
Description
1
Length
User data length >5 bytes
2
Node number
Node number
3
0x0C
Command SDO Block Write Download
4
Sequ no
Sequential number beginning with 1
5–N
Data
Data of the respective segment (max. 57 bytes)
(N+1)
CRC
Check sum
Tab. 17: Response SDO Block Download (Slave to Master)
Byte
Contents
Description
1
Length
User data length >5 bytes
2
Node number
Node number
3
0x0C
Command SDO Block Write Download
4
Ack Sequ
Sequential number received
5
CRC
Check sum
The SDO Block Write Download telegram must be sent by the master in sections one after
another with sequential numbers and acknowledged by the slave until the complete
block has been sent. The last block segment is identified with the command “SDO Block
Write End”.
Tab. 18: Request SDO Block Download End (Master to Slave)
Byte
Contents
Description
1
Length
User data length >5 bytes
2
Node number
Node number
3
0x0D
Command SDO Block Write End
4
Sequ no
Sequential number of the last segment
5–N
Data
Data of the respective segment (max. 57 bytes)
(N+1)
CRC
Check sum