Siemens SINUMERIK 840Di Manual page 219

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I/O addresses

I/O address range

Selective access

SINUMERIK 840Di Manual (HBI) – 06.03 Edition

After the dialog has been quitted, the DP slave PP72/48 is inserted into the DP

master system. Inserting of the detail view makes visible DP slave PP72/48 in

the station window.

The I/O addresses are assigned by "HW Config" automatically. These I/O ad-

dresses should be modified in view of the following supplementary conditions:

I/O address range of the NC

Selective access to the input/outputs by the PLC.

For compatibility reasons and for future system expansions, the I/O addresses

256–271 should not be assigned.

In the case of I/O addresses > 256, the PLC cannot access the individual input/

outputs. The input/output data must first be copied to internal flags of the PLC.

To this aim, use the system functions SFC14 and 15.

For the reasons above, it is recommended to assign the I/O addresses to the

range between 0 and 255.

7 PROFIBUS DP Communication

7.3 SIMATIC S7 project