Siemens SINAMICS V20 Manual page 16

3 Principle of Operation
3.2 Blocks
Table 3-2: Block parameters of the UssCyclic FB
STW
speedSetpoint
ZSW
actual Speed
Function
In this application example, the block only has the task to ensure the supply of the
called USS_DRV or USS_Drive_Control system instruction.
The following default settings were made in the associated InstUssCyclic instance
DB:

STW = 0806
This means that bits 01 (OFF2), 02 (OFF3) and 11 (Reverse) have already
been set when the controller is restarted.

speedSetpoint = 50.0
Ensures that the drive immediately ramps up with the parameterized ramp-up
time to 50% of its rated speed when the ON/OFF1 button is pressed.
SINAMICS V20 at S7-1200/1500 via USS
Entry ID: 109480894, V1.0,
Name
Word
Real
OUT parameter
Word
Real
hex
09/2018
Data type
IN parameter
Control word of the SINAMICS
V20
With the UssCyclic FB, the
following STW bits can be
transferred to the SINAMICS
V20:
ON/OFF1
OFF2
OFF3
Fault ack.
Reverse
Speed setpoint
Specified as a percentage of the
frequency of the inverter output
and therefore independent of the
pole pair number and motor slip.
Status word of the SINAMICS
V20
With the UssCyclic FB, the
following ZSW bits can be
received from the SINAMICS
V20:
Inverter running (bit 02)
Motor runs right (bit 14)
ON inhibit active (bit 06)
Inverter fault active (bit 03)
Actual speed
Specified as a percentage of the
frequency of the inverter output
and therefore independent of the
pole pair number and motor slip.
Meaning
(bit 00)
(bit 01)
(bit 02)
(bit 07)
(bit 11)
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