WAGO -I/O-SYSTEM 750 Series Manual page 114
Fieldbus independent i/o modules,
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114 • Appendix
Mailbox command - Reference
RD_74_ID (RD_74_ID, 0x5C)
The ID string of a slave according to profile S-7.4 is read with this function.
As the string can be longer than the mailbox, it is stored in a buffer, the
contents of which can be read in sections from index i.
The first byte in the buffer defines the length of the string that has been read.
When i = 0, the string is read from the slave, otherwise the function responds
from the store, as a result of which the data can be read consistently.
Byte
Byte
...
n+2
Request
7
6
5
2
2
2
1
2
T
-
3
4
Response
7
6
5
2
2
2
1
2
T
Buffer byte i+n-1
4
3
2
2
2
2
2
0x5C
-
Slave address
i
4
3
2
2
2
2
2
0x5C
Result
Buffer byte i
...
1
0
2
1
0
2
WAGO-I/O-SYSTEM 750
I/O Modules
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