Siemens DP/AS-Interface Link 20E, Руководство пользователя

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Data Exchange Between the DP Master and AS-i Slave
48
DP/AS-Interface Link 20E
Release 11/2002
C79000-G8976-C138–04
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
DP/AS-i Link 20E
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
AS-i
slave 2
AS-i
slave 1
AS-i
slave n
ÍÍÍÍ
ÍÍÍÍ
ÍÍÍÍ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
AS-i slaves
ÍÍÍ
ÍÍÍ
ÎÎÎ
ÍÍÍ
ÍÍÍ ÎÎÎ
ÎÎÎ
ÍÍÍ
ÍÍÍ ÎÎÎ
ÎÎÎ
PROFIBUS
AS-Interface
DP/AS-i Link
Cyclic services
SF
APF
CER
AUP
CM
6GK7 1415 2AA0
1
2
3
4
5
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7
8
0
9
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11
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13
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31 X 2
3 4
DIA
ADR
BF
DP-AS Interface
Link 20
Read binary values
Write binary values
DP
Output area
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.