Communication extension card
CANopen communication card
-27-
Response codes indicating successful reading vary according to the character length of items
in the object dictionary, and the response code indicating successful writing are 0×60. The
response codes indicating reading failure and writing failure are both 0x80. See Table 3-9.
Table 3-8 SDO request codes and requested data
Request
code type
Request
code
Command
description
Requested data
Byte4
Byte5
Byte6
Byte7
Write
0x23
Writes 4-byte data
bit7-0
bit15-8
bit23-16
bit31-24
0x2B
Writes 2-byte data
bit7-0
bit15-8
-
-
0x2F
Writes 1-byte data
bit7-0
-
-
-
Read
0x40
Reads data
-
-
-
-
Table 3-9 SDO response codes and response data
Response
code type
Response
code
Command
description
Response data
Byte4
Byte5
Byte6
Byte7
Read
0x43
Reads 4-byte data
bit7-0
bit15-8
bit23-16 bit31-24
0x4B
Reads 2-byte data
bit7-0
bit15-8
-
-
0x4F
Reads 1-byte data
bit7-0
-
-
-
Write
0x60
Writing succeeds
-
-
-
-
Read/write
0x80
Reading/writing
fails
Interruption error code
bit7-0
bit15-8
bit23-16 bit31-24
Note:
The symbol "-" in Table 3-8 and Table 3-9 indicates that the byte is reserved and
provides no function.
Table 3-10 describes the interruption error codes.
Table 3-10 Interruption error codes
Interruption code
Code function description
0503 0000
Triggering bit not alternated
0504 0000
SDO protocol times out
0504 0001
Invalid or unknown client/server
0504 0002
Invalid block size
0504 0003
Invalid sequence number
0504 0004
CRC error
0504 0005
Memory overflow
0601 0000
No access to the object
0601 0001
Attempts to read a write-only object
0601 0002
Attempts to write information to a read-only object
0602 0000
Object cannot be found in the object dictionary
0604 0041
Object cannot be mapped to PDO
0604 0042
Number and length of the object to be mapped exceeds the PDO
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