Siemens CM343 Series Manual de servicio descargar pdf (Pagina 41)

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

Example of a Configuration

Figure 2−2 shows an example of the PLC CPU addressing 4 standard or A slaves.

The base addresses m = 256 for the I/O data are configured in STEP 7.

The bits relevant for the user program are shown on a gray background. The bits

shown on a white background are irrelevant for the user program since no AS-i

slave bits are assigned here.

DP master

Input bytes

234

567

271

4 I module

Slave no. 2 Slave no. 3 Slave no. 4

Slave no. 31

AS-i slaves

4 I module 4 I/4 O module2 I/2 O module 4 O module

258

271

256

257

258

slave 1

slave 2

slave 3

slave 30

slave 4

slave 5

slave 2 slave 3

slave 4

slave 5

slave 30

slave 31

Bit 0

Bit 1Bit 2

Bit 3

Bit 0

Bit 0 Bit 0

Bit 0

Bit 1

Bit 3

Bit 2

Bit 2Bit 2

Bit 2

Bit 3

Bit 2

Bit 3

Bit 3Bit 3

Bit 3 Bit 1 Bit 0

Bit 1

Bit 0

Output bytes

Bit 2

slave 31

Bit 0

Bit 1

Bit 3

257

7 6 5 4

3 2 1 0

Figure 4-2

In the figure above, for example, the 2I/2O module (AS-i slave number 3 with two

inputs and two outputs) occupies bits 0 and 1 in input byte 1 and bits 2 and 3 in

output byte 1.

The assignment of the AS-i terminals of the AS-i bus modules to the data bits of

the input/output bytes is shown below based on the example of slave number 3:

1 0 Bit no.

Input byte 1

Terminal 1 on AS-i bus module

Terminal 2 on AS-i bus module

3 2 Bit no.

Output byte 1

Terminal 3 on AS-i bus module

Terminal 4 on AS-i bus module

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 139 140

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Siemens CM343 Series Manual de servicio Pagina 41

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