Siemens CP 243-2 - Manual (Page 55)

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