EtherCAT Information
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11/17/2009 TR - ECE - BA - DGB - 0069 - 02 Page 79 of 119
Write services, Client --> Server
● Initiate SDO Download Expedited
The Expedited SDO Download service is used for the accelerated
transmission of ≤ 4 bytes. The server responds with the result of the
download request.
● Initiate SDO Download Normal
The Initiate SDO Download service is used for an individual transmission
of data, if the number of bytes can be accepted by the mailbox, or if a
segmented transmission is to be started with more bytes.
Read services, Server --> Client
● Initiate SDO Upload Expedited
The Expedited SDO Upload service is used for the accelerated
transmission of ≤ 4 bytes. The server responds with the result of the
upload request and the required data, in the event of successful execution.
● Initiate SDO Upload Normal
The Initiate SDO Upload service is used for an individual transmission of
data, if the number of bytes can be accepted by the mailbox, or if a
segmented transmission is to be started with more bytes. The server
responds with the result of the upload request and the required data, in the
event of successful execution.