
EtherCAT Information
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TR-Electronic GmbH 2010, All Rights Reserved
10/07/2013
TR - ECE - BA - DGB - 0080 - 05
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4.7.1.3 Initiate SDO Upload Expedited Request
Read, Server --> Client
Frame Fragment
Data field
Data type
Value / Description
Mailbox Header
Length
WORD
0x06: Length of the mailbox service data
Address
WORD
Source station address, if Master = Client
Destination station address, if Slave = Client
Channel
unsigned:6
0x00, reserved
Priority
unsigned:2
0x00: Lowest priority
…
0x03: Highest priority
Type
unsigned:4
0x03: CANopen over EtherCAT (CoE)
reserved
unsigned:4
0x00
CANopen Header
Quantity
unsigned:9
0x00
reserved
unsigned:3
0x00
Service
unsigned:4
0x02: SDO Request
SDO
Comm
and
code (CCD
)
Size indicator
unsigned:1
0x00
Transmission type
unsigned:1
0x00
Data record size
unsigned:2
0x00
Total access
unsigned:1
0x00
Command
unsigned:3
0x02: Initiate Upload Request
Index
WORD
Object index
Sub-Index
BYTE
Object sub-index
Table 3: Initiate SDO Upload Expedited Request
The following SDO read frame can be derived from the above protocol:
CCD
Meaning
Valid for
0x40
Read request
SDO Request