Pepperl+Fuchs AS-I 3.0, Руководство пользователя

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Is
s
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e
d
a
te
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7
.6
.2
0
1
3
20
AS-i 3.0 Command Interface
Commands of the Command Interface
4.2 Commands acc. to Profile S-7.4/S-7.5
4.2.1 Overview of the commands
4.2.2 WR_74_75_PARAM
With this function the parameter string of a slave according to profile S-7.4 is be-
ing written or the data transfer with a slave according to profile S-7.5 is started.
By a slave according to profile 7.5, data have to be registered into the buffer in
the same form, as they have to be sent by AS-i.
Since the string can be longer than the command interface, it is written into the
buffer in parts at first and then it is transferred to the slave.
n is the length of the part of the string which should be written into the buffer from
index i on.
If i
≡
0, then the string is being transferred to the slave.
Values for command
see page Command Value Meaning Req
Len Res
Len
page 20
WR_74_75_PARAM
1
1. There are improved versions of these commands. We don‘t recommend to use the old one any more.
5A
16
write S-7.4/S-7.5-slave parameter
≥
6 2
page 21
RD_74_75_PARAM
1 5B
16
read S-7.4/S-7.5-slave parameter 4
≥
3
page 22
RD_74_75_ID
1 5C
16
read S-7.4/S-7.5-slave ID string 4
≥
3
page 23
RD_74_DIAG
1 5D
16
read S-7.4/S-7.5-slave diagnostic string 4
≥
3
Tab. 4-22.
Request
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 5A
16
2 T – circuit
3 slave address
4 i
5 n
6 buffer byte i
… …
n+5 buffer byte i+n-1
Tab. 4-23.
Response
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 5A
16
2 T results
Tab. 4-24.