Transferring As-I Binary Values - Siemens DP/AS-Interface Link 20E Manual

Data Exchange Between the DP Master and AS-i Slave
2.3

Transferring AS-i Binary Values

Purpose
This section explains how the binary values of attached AS-i slaves can be
accessed by the user program on the DP master.
Interface Between the DP Master and
Via the DP/AS-i Link 20E, the DP master accesses the binary inputs and outputs
of the AS-i slaves in the cyclic DP mode. The inputs and outputs of the AS-i
slaves are mapped in a continuous data area in the DP master.
DP master
Cyclic services
Write binary values
DP
Output area
Read binary values
DP
Input area
Figure 2-1
From the point of view of the PROFIBUS DP master, the DP/AS-i Link 20E
occupies
S A maximum of 32 input bytes and a maximum of 32 output bytes
Addressing these bytes within the DP master (in the user program etc.) depends
on the PROFIBUS DP master being used.
You will find examples of this below. For more detailed information, refer to /3/ and
the manuals for your PROFIBUS DP master.
48
DP/AS-i Link 20E
DP/AS-i Link
29 24 19
28 23 18
27 22 17
31 26 21 16
30 25 20 15
PROFIBUS
Í Í Í
Í Í Í
ADR
Í Í Í Í Î Î Î
BF DP-AS Interface
Link 20
DIA
14 9 4 SF
13 8 3 APF
12 7 2
CER
Í Í Í Í
11 6 1 AUP
X 2
3 4
10 0 CM
5
6GK7 1415 2AA0
Í Í Í Í Í Í Í
Î Î Î Í Í Í
Î Î Î Î Î Î Î
Î Î Î Î
Î Î Î Î
Í Í Í
Î Î Î Í Í Í
Î Î Î
AS-Interface
DP/AS-Interface Link 20E
AS-i slaves
AS-i
slave 1
AS-i
slave 2
AS-i
slave n
Release 11/2002
C79000-G8976-C138–04