Siemens SINAMICS S120 Commissioning Manual page 52

Startdrive commissioning tool
2.5 User interface - trace function
Field/ Description
Mathematical
functions
DIF Simple subtraction with mean filter from 1st to 5th order
If the specification of an order is missing, simple subtraction is performed with a 1st order filter.
Examples
DIF($0,1)
DIF($0,5)
DIF($0)
Example: Calculate an acceleration curve from a velocity signal
: Velocity signal in meters per second
$0
Cycle time of the constant cycle velocity recording: 1 ms
Formula:
Unit:
DIF2 Double subtraction with mean filter from 1st to 5th order
If the specification of an order is missing, then double subtraction is executed with a 1st order filter.
Examples
DIF2($0,1)
DIF2($0,5)
DIF2($0)
Example: Calculate an acceleration curve from a position sequence
: Position sequence in meters
$0
Cycle time of the constant cycle position recording: 1 ms
Formula:
Unit:
The constant
1)
SAMPLETIME
52
→ Single subtraction with 1st order filter
→ Single subtraction with 5th order filter
→ Single subtraction with 1st order filter
DIF($0,1)/0.001
2
m/s
→ Double subtraction with 1st order filter
→ Double subtraction with 5th order filter
→ Double subtraction with 1st order filter
DIF2($0,1)/SQR(0.001)
2
m/s
is only available for equidistant recording cycles. Time unit for
SAMPLETIME
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
is always μs.