Siemens SIMATIC S7-300 Hardware And Installation Manual page 152

Commissioning
Sample program
Below you will see a small sample program for data exchange between DP master
and DP slave. The addresses used in the example are found in the table above.
In the DP slave CPU
L 2
T MB 6
L IB 0
T MB 7
L MW 6
T PQW 310
CALL SFC 14
LADDR:=W#16#D
RET_VAL:=MW 20
RECORD:=P#M30.0 byte 20
L MB 30
L MB 7
+ I
T MW 100
9-34
//Data pre-
processing in
the
DP slave
// Forward data
to the
DP master
L
T
L
L
+
T
L
+
T
CALL
LADDR:= W#16#0
RECORD:= P#M60.0 Byte 20
RET_VAL:=MW 22
//receive data
from DP master
//Reprocess
received data
S7-300 Programmable Controller Hardware and Installation
In the DP master CPU
PIB 222 // processing data
received
MB 50
in the DP master
PIB 223
B#16#3
I
MB 51
10 //Data preparation in
DP master
3
MB 60
SFC 15 //Send data to
DP slave
A5E00105492-02