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

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Data Exchange Between the DP Master and AS-i Slave
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DP/AS-Interface Link 20E
Release 11/2002
C79000-G8976-C138–04
2.3.1 Addressing AS-i Slaves
Notice
The following information relating to addressing applies in this form only to button
configuration (see Section 1.8 ) of the DP/AS-i Link 20E.
If you configure the AS-i slave using STEP 7, you must take into account the I/O
addresses documented there (see Section 1.9.4).
Interface to the AS-i Slaves
The DP/AS-i Link 20E assigns four bits (a nibble) of input data and four bits of
output data to every AS-i slave on the AS-i cable. The PROFIBUS DP master can
access this data cyclically.
Addressing the AS-i Input or Output Data on the DP Master
In total, the maximum of 62 AS-i slaves occupy 32 bytes of input data and 32 bytes
of output data (see table below). The start addresses of the input or output data
depend on the configuration of the PROFIBUS DP master.
In SIMATIC S7, the address range selected for the input and output data area
must always be identical.
Byte Number *) Bits 7–4 Bits 3–0
m+0 Status Nibble **) Slave 1 or 1A
Bit 3 | Bit 2 | Bit 1 | Bit 0
m+1 Slave 2 or 2A Slave 3 or 3A
m+2 Slave 4 or 4A Slave 5 or 5A
m+3 Slave 6 or 6A Slave 7 or 7A
m+4 Slave 8 or 8A Slave 9 or 9A
m+5 Slave 10 or 10A Slave 11 or 11A
m+6 Slave 12 or 12A Slave 13 or 13A
m+7 Slave 14 or 14A Slave 15 or 15A
m+8 Slave 16 or 16A Slave 17 or 17A
m+9 Slave 18 or 18A Slave 19 or 19A
m+10 Slave 20 or 20A Slave 21 or 21A
m+11 Slave 22 or 22A Slave 23 or 23A
m+12 Slave 24 or 24A Slave 25 or 25A
m+13 Slave 26 or 26A Slave 27 or 27A
m+14 Slave 28 or 28A Slave 29 or 29A
m+15 Slave 30 or 30A Slave 31 or 31A
m+16 reserved Slave 1B
m+17 Slave 2B Slave 3B
m+18 Slave 4B Slave 5B
m+19 Slave 6B Slave 7B
m+20 Slave 8B Slave 9B