WAGO -I/O-SYSTEM 750 Series Manual page 112
Fieldbus independent i/o modules,
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112 • Appendix
Mailbox command - Reference
WR_74_PARAM (WR_74_PARAM, 0x5A)
The parameter string of a slave according to profile S-7.4 is written with this
function. As the string can be longer than the mailbox, it is first written in
sections to a buffer and only then transmitted to the slave.
n is the length of the partial string, which is to be written to the buffer from
index i.
When i = 0, the string is transmitted to the slave.
Byte
...
n+5
Byte
Request
7
6
5
2
2
2
1
2
T
-
3
4
5
6
Buffer byte i+n-1
Response
7
6
5
2
2
2
1
2
T
4
3
2
2
2
2
2
0x5A
-
Slave address
i
n
Buffer byte i
...
4
3
2
2
2
2
2
0x5A
Result
1
0
2
1
0
2
WAGO-I/O-SYSTEM 750
I/O Modules
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