Siemens SIMATIC NET CP 343-2, Manual

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4 Data Exchange between User Program and AS−i Slaves
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CP 343−2 / CP 343−2 P AS−Interface Master
Release 08/2008
C79000−G8976−C149−04
If you require bit access to slave data, you can, for example, use the strategy
shown in the following program example of a CP with base address 256:
Table 4-1
STL Explanation
//Read in binary input data of standard/A slaves
L PID 256
T DB20.DBD 0
L PID 260
T DB20.DBD 4
L PID 264
T DB20.DBD 8
L PID 268
T DB20.DBD 12
Examples: binary access to standard / A slaves
A DB20.DBX 0.1
A DB20.DBX 3.0
= DB20.DBX 47.3
//Output binary output data of standard/A slaves
L DB20.DBD 32
T PQD 256
L DB20.DBD 36
T PQD 260
L DB20.DBD 40
T PQD 264
L DB20.DBD 44
T PQD 268
//Slave 1, terminal 2
//Slave 7, terminal 1
//Slave 31, terminal 4
Note
If you use a PLC CPU with configurable I/O addresses (for example, 315-2DP),
you can also access the 16 bytes of I/O data directly via the process image using
single commands.