User guide

5 Function blocks
5.206 L_WndCalcLength - length calculation
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Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.206 L_WndCalcLength - length calculation
On the basis of the speed and the diameter of a roll moving along with the material, this FB serves
to carry out a continuous length calculation.
• If a gearbox is switched between the roll and the speed sensor, the sensor speed is converted to
the speed of the roll according to the gearbox factor.
• The output signal dnLength has a resolution of 1 mm and can display a maximum of 2000 km.
Inputs
Function library: LenzeWinder
Runtime software licence:  Motion Control HighLevel  Motion Control TopLevel
Identifier/data type Information/possible settings
dnNSensor_s
DINT
Current encoder speed in [rpm]
• 15000 rpm ≡ 2
26
≡ 67108864
dwDiameter
DWORD
Diameter of the impeller/roll in [μm]
• 1000 μm ≡ 1 mm; 1000000 μm ≡ 1m
• Internal limitation to 10 m
dnGearNumerator
DINT
Gearbox factor (numerator)
of the gearbox between the impeller/roll and the speed sensor
dnGearDenominator
DINT
Gearbox factor (denominator)
of the gearbox between the impeller/roll and the speed sensor
dwNominalTif
DWORD
Rated deceleration time for braking process in [ms]
• Is triggered if the pre-switch-off length has been reached (output
bStartDec =TRUE).
• The reference value can be selected in C04840 (Lenze setting: material speed set-
point).
• 1000 ms ≡ 1s
• Internal limitation to 10000 s.
dwResidualLength
DWORD
Remaining residual length after the winding process in [mm]
• 1000 mm ≡ 1 m; 1000000 mm ≡ 1km
• Internal limitation to 1000 km
bReset
BOOL
Reset length acquisition
TRUE The length acquisition and the digital output signals bStartDec and
bRefReached are reset.
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