Chapter 4. Data Communication Protocol of the CANopen
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4.1.2 SDO communication
Regardless of the connection of the CANopen with the master, this is the
protocol for the client to read or write data on the server.
SDO Download means the client writing data on the server, and the SDO
Upload is the client reading data from the server.
4.1.3 PDO communication
According to the protocol, the only the Index and SubIndex Data which are
specified to the PDO are transmitted.
Though the data type of the PDO can be set up by mapping, the IG5A
prohibits setting by mapping.
PDO has two types which are Transmit-PDO (TPDO) and Receive-PDO
(RPDO).
PDO is classified into the Producer and Consumer, which are different from
the server and client in the SDO communication. The Producer can be a
client or a server. The Producer of the TPDO is a server and the Producer
of the RPDO is a client. This is because the PDO is classified in the
perspective of the server. The Consumer is the recipient of the PDO
created by Producer.
▶
Transmission modes
Synchronous transmission: PDO is transmitted according to SYNC frame
Event-driven transmission: PDO is transmitted by an event.
Code
파라미터
이름
초기값
Range
설명