AS-Interface
Command Interface
Subject to reasonable modifications due to technical advances.
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10.3.3
Acyclic commands
10.3.3.1
Overview of the commands
Values for command
10.3.3.2
WRITE_ACYCLIC_TRANS
This function activates different arts of acyclic transfer (S-7.4, S-7.5 and safety
monitor). The results have to be read out with READ_ACYCLIC_TRANS. Even
though this function runs in the background and doesnt hold the master during the
transmission, it ist intended to act as a substitute for (RD_74_75_PARAM,
WR_74_75_PARAM, RD_74_75_ID, RD_74_DIAG and „Safety at Work“- monitor
diagnnostic).
Since the transferred data can be longer than the command interface, it is written
into the buffer. The content of the buffer can be read in parts from index.
n
is the length of the part string, that (from Index (i)) should be written in the buffer.
The transmission proceeds, if i=0.
Response
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
5D
16
2
T
result
3
buffer byte i
…
…
n+2
buffer byte i+n-1
see page
Command
Value
Meaning
Req
Len
Res
Len
WRITE_ACYC_TRANS
4E
16
Write acyclic transfer
≥
7
2
READ_ACYC_TRANS
4F
16
Read acyclic transfer
5
≥
2
Request
Byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
4Eh
2
circuit
3
slave
4
buffer Index (i) high
5
buffer Index (i) low
6
command
1
7
number of(n)
8
data
…
...
x
data+n
