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Data transmission with PDO and SDO
Operation manual
ID 441896.05
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31
7
7.2.1
Preselection of the axis
Parameter addressing
Only 2 bytes are available for the index and 1 byte for the subindex in the
addressing of parameters via SDO based on CANopen
®
. However, the
parameters of STÖBER devices cover the address space of 4 bytes. To combined
the address spaces, instead of addressing the axis via the index and subindex,
the selection is made using parameter
A11.1
, the axis to be edited.
7.2.2
Expedited Transfer
With SDO communication, the simplified Expedited Transfer type of transmission
is used for all parameters having a data type of up to 4 bytes. All four data bytes
fit into one telegram with this type of transmission. Data organization on the bus
uses the Intel-Format: The most significant byte/word has the higher address in
storage and is sent later to the bus (Little-Endian)..
1
st
byte
2
nd
byte 3
rd
byte 4
th
byte 5
th
byte 6
th
byte 7
th
byte 8
th
byte
23
hex
LSB
MSB
LSB
MSB
LSB
MSB
Command
Index
Sub-
Index
LSW-Data
MSW-Data
1
st
byte
2
nd
byte 3
rd
byte 4
th
byte 5
th
byte 6
th
byte 7
th
byte 8
th
byte
60
hex
LSB
MSB
LSB
MSB
LSB
MSB
Command
Index
Sub-
Index
unused
1
st
byte
2
nd
byte 3
rd
byte 4
th
byte 5
th
byte 6
th
byte 7
th
byte 8
th
byte
40
hex
LSB
MSB
LSB
MSB
LSB
MSB
Command
Index
Sub-
Index
unused
1
st
byte
2
nd
byte 3
rd
byte 4
th
byte 5
th
byte 6
th
byte 7
th
byte 8
th
byte
42
hex
LSB
MSB
LSB
MSB
LSB
MSB
Command
Index
Sub-
Index
LSW-Data
MSW-Data
1
st
byte
2
nd
byte 3
rd
byte 4
th
byte 5
th
byte 6
th
byte 7
th
byte 8
th
byte
80
hex
LSB
MSB
LSB
MSB
LSB
MSB
Command
Index
Sub-
Index
Additional-Code
Error-
Code
Error-
Class