Siemens CPU 312C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
9-30 A5E00105492-03
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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.
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L 2
T MB 6
L IB 0
//Data pre-
processing in
the
DP slave
T MB 7
L MW 6
T PQW 310
// Forward data
to the
DP master
L PIB 222
T MB 50
L PIB 223
// processing data
received
in the DP master
.
L B#16#3
+ I
T MB 51
L 10 //Data preparation in
DP master
+ 3
T MB 60
CALL SFC 15 //Send data to
DP slave
LADDR:= W#16#0
RECORD:= P#M60.0 Byte 20
RET_VAL:=MW 22
CALL SFC 14
LADDR:=W#16#D
//receive data
from DP master
RET_VAL:=MW 20
RECORD:=P#M30.0 byte 20
L MB 30
L MB 7
+ I
//Reprocess
received data
T MW 100
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