Specifications

sigmadue - IEC 61131-3 Function Block Library
96
Parameters
Default
Here are reported the default values for the input/output parameters.
Input Parameters Default
OCRB
Defines the zone across the setpoint where the PID algorithm is not
affected by the overshoot control
DBND
Is the zone where it is possible to separate or overlap the heat and
cool actions
DTRK Tracking Operating mode Command
TRK Tracking signal value
DAM Automatic/Manual Operating Mode Command
AM_VAL Manual Value desired as Output
DAUX Auxiliary Operating mode Command
AUX Auxiliary signal value
PV_LO Lo Span of the Process Value
PV_HI Hi Span of the Process Value
OUTH_HI
Hi value for the heat output. This limit is active always except for
the manual movements of the output (i.e. DAM active).
OUTC_HI
Hi value for the cool output. This limit is active always except for the
manual movements of the output (i.e. DAM active).
Output Description
OUTH Output for the Heat Action
OUTC Output for the Cool Action
OUTHC Global output value for the visualization
OVERLAP Active if both OUTH and OUTC are active
TPB Pb calculated from the tuning algorithm
TTI Ti calculated from the tuning algorithm
TTD Td calculated from the tuning algorithm
TRCGA RCGA calculated from the tuning algorithm
AT_STS This output is true during tuning activities
AT_FAIL
This output is set to false at the tuning process beginning and is set
to true if tuning process fails
Input Description
Input Default Value
PB
These parameters need the connection with an external variable.
The default value will be the default value for these external VAR.
Please note that in any case internally the PID actions will be limited
using these ranges:
PB: 0.5... 1000.0
TI: 1.0... 6000.0 - the value 0.0 is allowed to exclude the
integral action
TD: 0.5... 600.0 -
the value 0.0 is allowed to exclude the
derivative action
RCGA: 0.1... 10.0
TI
TD
RCGA
SP 0.0
MEAS 0.0
M_RES 50.0
FFWD -100
OC 1.0