Drive functions
7.3 Function modules
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
313
7.3.8.23 INT (integrator)
Brief description
● Function block with integrating action
● Integrator functions:
– Set initial value.
– Adjustable integral time constant
– Adjustable limits
– For normal integrator operation, a positive limit value must be specified for LU and a
negative limit value for LL.
Mode of operation
The change in output variable Y is proportional to input variable X and inversely proportional
to the integral time constant TI.
Output Y of the integrator can be limited via the inputs LU and LL. If the output reaches one
of the two limits, a signal is sent via the outputs QU or QL. If LL ≥ LU, then output Y = LU.
The discrete values (TA is the configured sampling time of the function block) are calculated
according to the following algorithm:
Yn = Yn-1 + (TA/TI) Xn
Y
n
Value of Y in sampling time n
Y
n-1
Value of Y in sampling time n-1
X
n
Value of X in sampling time n
When S = 1, the output variable Y is set to the setting value SV. Two functions can be
performed via S:
● Track integrator (Y = SV)
The digital input is S = 1 and the setting value SV is changed. If applicable, the output
makes a jump to the setting value immediately after the setting operation.
● Set integrator to initial value SV.
S is switched to 1. S is then set to 0, and the integrator starts from SV in the direction
specified by the polarity of input variable X.
Note
TI is limited internally: TI = TA
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