SINAMICS V20 at S7-1200/1500 via USS 
Entry ID: 109480894,    V1.0,    09/2018 
 
 Siemens AG 2018 All rights reserved 
Figure 3-4: Block call diagram for SIMATIC S7-1500 
User program System blocks Data blocks
Main
[OB1]
InstUssCyclic
[DB1]
(instance DB of FB UssCyclic) 
UssCyclic
[FB1]
USS_Drive_Control
[FB631]
Cyclic interrupt
[OB30]
USS_Port_Scan
[FB630]
InstUssCyclicInterrupt
[DB2]
(instance DB of FB 
UssCyclicInterrupt) 
UssCyclicInterrupt
[FB2]
instUssDriveControl
USS_DB
 
The UssCyclic and UssCyclicInterrupt user blocks use optimized block access. 
3.2  Blocks 
3.2.1  UssCyclicInterrupt [FB2] 
Call 
All activities relating to processing USS communication for the communication 
module with the parameterized hardware ID should be combined in this block.  
Figure 3-5: UssCyclicInterrupt user FB 
 
The block name is intended to indicate that the block is called by the cyclic interrupt 
OB.