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Access to the Data of the AS-i Slaves

3-7

SIMATIC NET CP 243-2 AS-i Master

C79000-G8976-C142/02

3.1.2 Access to the AS-i User Data

Data Access with STEP 7 Micro

To access the binary data of the slaves, you use the analog transfer commands of

the STEP 7 Micro/WIN32 programming language.

Example

If you want to access individual bits of the slave data, you can use the method

shown in the following sample program.

The example created with STEP 7 Micro/WIN32 is valid for a CPU 222 with a

CP 243-2 plugged in directly beside it:

OB1 (STL)

NETWORK 1

LD SM0.1 //If: bit “First Scan”:

SI Q1.7, 1 //PLC_RUN = 1

LD I1.1 //If: CP 243-2_READY

CALL 1 //Then: AS-i I/O processing (standard or A slaves)

SBR 1 (STL)

NETWORK 1

LD SM0.0 //Always 1

RI Q1.0,6 //Select bank 0

BMW AIW0, VW100, 8 //Transfer standard slaves

SI Q1.0,5 //Select bank 31

BMW AIW0, VW116, 8 //Transfer B slaves

//Below, several examples of access to AS-i bits

LD V100.0 //If bit 1 of slave 1

A V115.1 //And bit 2 of slave 31

A V116.0 //And bit 1 of slave 1B

= V203.2 //The bit 3 of slave 7 = 1

LD SM0.0 //Always 1

RI Q1.0,6 //Select bank 0

BMW VW900, AOW0, 8 //Transfer standard slaves

SI Q1.0,5 //Select bank 31

BMW AIW0, AOW0, 8 //Transfer B slaves

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Siemens SIMATIC NET Manuel de service Page 55