Siemens CP 243-2 User Manual

Access to the Data of the AS-i Slaves

3-15

SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02

You access the analog data of the AS-i slaves using the analog commands of the
“STEP 7 Micro/WIN32” programming language.

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).

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

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