86 • CANopen
Network
Communication
WAGO-I/O-SYSTEM
750
CANopen
Client
Client
Initiate SDO Download
Initiate SDO Download
Data
Data
ccs = 1
scs = 3
x
x
x
x
n
e
e
s
m
m
s
request
confirm
indication
response
0
0
.0
.0
.7
.7
.6
.6
.5
.5
.4
.4
.3
.2
.3
.2
.1
.1
1
1
4
4
8
8
Server
Server
ccs:
client command specifier 1: initiate download request
scs:
server command specifier 3: initiate download response
n:
only valid if e = 1
and s = 1, otherwise 0.
If n is valid, it displays the number of bytes which
do not contain any data. Example:
3 data bytes, e = 1 and s = 1, n = 4 - 3 = 1
e:
transfer type
0: normal transfer, number of the bytes to be writ-
ten >= 5 byte
1: expedited transfer, number of the bytes to be
written < 5 byte
s:
size indicator
0: data set size is not displayed
1: data set size is displayed
s is always 1
m:
multiplexor
Index and Sub-Index of object directory
Index, Low Byte : Byte #1
Index, High Byte: Byte #2
Sub-Index: Byte #3
d:
data
e = 0, s = 0: d is reserved for further use of CiA
e = 0, s = 1: d contains the number of bytes for
download
Byte 4 contains the LSB and Byte 7 contains the
MSB.
e = 1: d contains the data
X:
Not used, always 0
reserved:
Reserved for further use of CiA