Specifications

sigmadue - IEC 61131-3 Function Block Library
94
Output parameter
Description This function block provides the functionalities of a complete double action regulator.
It needs as input the process variables (
SP and MEAS ) in engineering format (the
range is passed as input from the variables P
V_LO and PV_HI ), the Ascon PID
parameters (
PB, TI, TD, RCG, FFWD, M_RES, OC, OCRB ), the tuning commands
(
TRUN and AUTOUPDATE ), and the signals for the manual access of the block
(
TRK, AUX,DTRK,DAUX,DAM and AM_VAL ). As output it provides the control values
for the two actions (
OUTH and OUTC , limited using the values OUTH_HI and
OUTC_HI ), an output ( OUTHC with range [-OUTC_HI… +OUTH_HI ]) devoted to the
visualization, and all the parameters calculated from the tuning parameters (
TPB, TTI,
TTD, TRCGA, AT_STS, AT_FAIL
).
The parameters
PB, TI, TD, RCGA, here indicated as inputs, in the FB code are
declared as
IN_OUT parameters: THIS MEANS THAT YOU ALWAYS MUST
PROVIDE AN INPUT CONNECTION WITH A PROCESS VARIABLE FOR EACH OF
THEM, and please note that when you create an instance, you will have the same
parameters as input and as output.
AM_VAL REAL Output Auto/Manual value [%] -100.0…100.0
DAUX BOOL Output Digital Auxiliary command
AUX REAL Output Auxiliary Signal [%]
-OUTC_HI …
OUTH_HI
PV_LO REAL PV input Low range value [e.u.]
PV_HI REAL PV input High range value [e.u.]
OUTH_HI REAL Heat Control Output High limit value [%] 0… 100.0
OUTC_HI REAL Cool Control Output High limit value [%] 0… 100.0
Label Type Description Range
OUTH REAL Heat Control Output value [%] 0... OUTH_HI
OUTC REAL
Cool Control Output value [%] 0... OUTC_HI
OUTHC REAL
Full range Output value [%]
OUTC_HI...
+OUTH_HI
OVERLAP BOOL
Active if both OUTH and OUTC are active
TPB REAL Tuning Result - Calculated Proportional Band [%]
TTI REAL Tuning Result - Calculated Integral Time [s]
TTD REAL Tuning Result - Calculated Derivative Time [s]
TRCGA REAL
Tuning Result - Calculated Relative Cool Gain
Parameter [num]
AT_STS BOOL This output is true during tuning activities
AT_FAIL BOOL
This output is set to false at the beginning of
tuning processand true in case process fails
Label Type Description Range