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byte
1
2
3
...
n+2
8.3.3
Acyclic commands
8.3.3.1
Overview of the commands
see page
Command
page 66
WRITE_ACYC_TRANS
page 68
READ_ACYC_TRANS
8.3.3.2
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.
Byte
1
2
3
4
5
6
7
8
...
x
Subject to reasonable modifications due to technical advances.
66
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7
6
5
2
2
2
T
Values for command
Value
4E
16
4F
16
7
6
5
2
2
2
Command Interface
Response
4
3
2
2
5D
16
result
buffer byte i
...
buffer byte i+n-1
Meaning
Write acyclic transfer
Read acyclic transfer
Request
4
3
2
2
4Eh
circuit
slave
buffer Index (i) high
buffer Index (i) low
1
command
number of(n)
data
...
data+n
AS-Interface
2
1
0
2
2
2
Req
Res
Len
Len
≥7
≥2
5
2
1
0
2
2
2
Copyright Pepperl+Fuchs, Printed in Germany
2
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