Siemens Simatic S7-1500 Manuel - Page 12

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3 Principle of Operation

3.1 Complete overview

Note

Know-how protected use of the UssCyclic user block in a library is not possible.

Reason:

The USS_DRV system FB cannot put its data into the InstUssCyclic instance DB

of the calling UssCyclic block as a multi-instance; it uses the InstUssDrv single

instance. This is necessary as the USS_PORT system FB can only access the

entire instance DB of USS_DRV via its USS_DB formal parameter of the

USS_BASE data type; it cannot access an instance data block within

InstUssCyclic.

3.1.3

Implementation with SIMATIC S7-1500

Use the following system instructions:



USS_Port_Scan

to process communication via the USS



USS_Drive_Control

to prepare the send data and evaluate the response data

These system instructions can be found in the Instructions task card,

Communication.

Figure 3-3: USS instructions for S7-1500

SINAMICS V20 at S7-1200/1500 via USS

Entry ID: 109480894,

V1.0,

09/2018

network