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Access to the Data of the AS-i Slaves

3-15

SIMATIC NET CP 243-2 AS-i Master

C79000-G8976-C142/02

3.2.2 Access to the AS-i Analog Data

Data Access with STEP 7 Micro

You access the analog data of the AS-i slaves using the analog commands of the

“STEP 7 Micro/WIN32” programming language.

Example

The following example shown in STL is valid for a CPU 222 with a CP 243-2

plugged in directly beside it. The program reads the analog input value of slave 3

(channel 2) cyclically and sends it to the analog output slave 16 (channel 1).

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 4 //Then : process AS-i analog values

SBR 4 (STL)

NETWORK 1

LD SM0.0 //Always 1

RI Q1.0,6 //Select bank 33

SI Q1.5,1 //Select bank 33

SI Q1.0,1 //Select bank 33

MOVW AIW10, VW50 //Read slave 4, channel 2

RI Q1.0,1 //Select bank 40

SI Q1.3,1 //Select bank 40

MOVW VW50, AOW0 //Write slave 17, channel 1

RI Q1.0,6 //Important: deselect the analog bank

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Siemens SIMATIC NET Wartungshandbuch Seite 63