9
Parameter data transfer
9.2
Reading and writing parameters
74
Lenze · E94AYCET communication module (EtherCAT®) · Communication Manual · DMS 10.2 EN · 11/2018 · TD06
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SDO Download Expedited Request
An "SDO Download Expedited Request" is effected if the data length of the parameter data to be
written is up to 4 bytes.
Detailed breakdown of the data for an "SDO Download Expedited Request":
SDO frame area
Data field
Data type / length
Value / description
Mailbox header
Length
WORD
2 bytes
0x0A: Length of the mailbox service data
Address
WORD
2 bytes
Station address of the source if an EtherCAT
master is the initiator.
Station address of the target if an EtherCAT slave
is the initiator.
Channel
WORD
6 bits
(0 ... 5)
0x00: Reserved
Priority
2 bits
(6, 7)
0x00: Lowest priority
...
0x03: Highest priority
Type
4 bits
(8 ... 11)
0x03: CANopen over EtherCAT (CoE)
Reserved
4 bits
(12 ... 15)
0x00
CANopen header
Number
WORD
9 bits
(0 ... 8)
0x00
Reserved
3 bits
(9 ... 11)
0x00
Service
4 bits
(12 ... 15)
0x02: SDO request
SDO
Size indicator
BYTE
1 bit
(0)
0x01: Size of the data in "Data set size"
Transfer type
1 bit
(1)
0x01: Expedited transfer
Data set size
2 bits
(2, 3)
0x00: 4 bytes of data
0x01: 3 bytes of data
0x02: 2 bytes of data
0x03: 1 byte of data
Complete access
1 bit
(4)
0x00: The entry addressed with index and
subindex is written.
0x01: The complete object is written. (Currently
not supported.)
Command specifier
3 bits
(5 ... 7)
0x01: Download request
Index
WORD
2 bytes
Index of the object
Subindex
BYTE
1 byte
Subindex of the object
0x00 or 0x01 if "Complete access" = 0x01.
Data
DWORD
4 bytes
Data of the object