Siemens SINAMICS S120 - Page 52

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