Specifications

sigmadue - IEC 61131-3 Function Block Library
102
3-3-6 S2_HC_TNATFREQ
FB Prototype S2_HC_TNATFREQ
Input parameters
Output parameters
Description This function block is able to perform the tuning calculation using the Natural
frequency 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
TDBMP
TRUNNING
TVALID
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Natural frequency
PV variable
Control
output
tuning start
End of the tuning
operating and
setting of the new
calculated terms