Siemens SINAMICS V20 - Page 14

3 Principle of Operation
3.2 Blocks
SINAMICS V20 at S7-1200/1500 via USS
Entry ID: 109480894, V1.0, 09/2018
14
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Note
Call other instances of a UssCyclicInterrupt not in the same but in other cyclic
interrupt OBs. This provides you (even if the cyclic interrupts have the same call
interval) with the option to equalize communication of multiple ports in terms of
time by changing the phase shift.
List of formal parameters
Table 3-1: Block parameters of the UssCyclicInterrupt FB
Name
Data type
Meaning
IN parameter
hwIdentifier
PORT
Hardware identifier of the
communication module
Preferably use the appropriate
symbolic system constant as the
actual parameter (in the project
tree, PLC tags). When replacing
the communication module, the
hardware identifier value may
change. However, the symbolic
name is retained.
The parameter is only passed on
to the USS_PORT or
USS_Port_Scan system
instruction.
baudrate
UDInt
Baud rate in bit/s
Allowed for SINAMICS V20:
0 9600 019200 038400
057600 076800 093750
115200
(default value: 38400 baud)
The parameter is only passed on
to the USS_PORT or
USS_Port_Scan system
instruction.
USS_DB
USS_BASE
(for S7-1200)
P2P_USS_BASE
(for S7-1500)
Data reference
S7-1200:
Reference to the instance DB of
the USS_DRV
2
instruction.
S7-1500:
Reference to the USS_DB
structure tag in the instance data
of the USS_Drive_Control
instruction.
2
In TIA Portal, the instance DB for the USS_DRV instruction is stored in the project tree,
System blocks>Program resources.