Specifications

Chapter 3 - AsconControlLib
103
3-3-7 S2_HC_TSTEPRESP
FB Prototype S2_HC_TSTEPRESP
Input parameters
Output parameters
Description This function block is able to perform the tuning calculation using the step response
algorithm
for a double action process (“heat and cool”) . It works together a P.I.D.
block with which shares the inputs and the outputs from and for the process and an
automatic/manual station with
Split Range capability . Please note that these
process parameters are using the range [0...100.0]. The method has the advantage
of a better accuracy in term of calculation with a reasonable speed calculation.
Input Type Description
ENABLE BOOL Function block enable
SP REAL Setpoint value [-100.0…+100.0]
MEAS REAL Measure value [-100.0…+100.0]
OUTH_HI REAL Limit value for heat action output [0...100.0]
OUTC_HI REAL Limit value for cool action output [0...100.0]
Output Type Description
TOUT REAL Function block output [OUTCHI...OUTH_HI]
TPB REAL Calculated proportional band
TTI REAL Calculated integral time [s]
TTD REAL Calculated derivative time [s]
TRCGA REAL Calculated relative cool gain
TBMP BOOL Bumpless command for the P.I.D.
TRUNNING BOOL Running flag
TVALID BOOL Successful tuning calculation flag
ENABLE
SP
MEAS
OUTH_HI
OUTC_HI
BOOL
REAL
REAL
REAL
REAL
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REAL
REAL
REAL
REAL
REAL
BOOL
BOOL
BOOL
TOUT
TPB
TTI
TTD
TRCGA
TBMP
TRUNNING
TVALID
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STEP response
SP
End of the
tuning operating and
setting of the new
calculated terms
Start of autotune
operation
Setpoint
change
PV variable
Control
output