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4 Data Exchange between User Program and AS−i Slaves

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.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 139 140

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Siemens CM343 Series Manual de servicio Pagina 43