Specifications

sigmadue - IEC 61131-3 Function Block Library
100
3-3-4 S2_TSTEPRESP
FB Prototype S2_TSTEPRESP
Input parameters
Output parameters
Description This function block is able to perform the tuning calculation using the step
response algorithm. It works together a P.I.D. block with which shares the inputs
and the outputs from and for the process. Please note that these process
parameters are using the range [0… 100.0]. The method has the big advantage
of fast calculation, with reasonable accuracy in term of calculation.
Input Type Description
ENABLE BOOL Function block enable
SP REAL Setpoint value [0…100.0]
MEAS REAL Measure value [0…100.0]
ACT_TYPE BOOL P.I.D. action type
OUTLO REAL Lo value for OUT output [0…100.0]
OUTHI REAL Hi value for OUT output [0…100.0]
Output Type Description
TOUT REAL Function block output [OUTLO…OUTHI]
TPB REAL Calculated proportional band [%]
TTI REAL Calculated integral time [s]
TTD REAL Calculated derivative time [s]
TDBMP BOOL Bumpless command for the P.I.D.
TRUNNING BOOL Running flag
TVALID BOOL Successful tuning calculation flag
ENABLE
SP
MEAS
ACT_TYPE
OUTLO
OUTHI
BOOL
REAL
REAL
BOOL
REAL
REAL
¡
¡
¡
¡
¡
¡
REAL
REAL
REAL
REAL
BOOL
BOOL
BOOL
TOUT
TPB
TTI
TTD
TDBMP
TRUNNING
TVALID
¡
¡
¡
¡
¡
¡
¡
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