Allen-Bradley LOGIX 5000 Reference Manual page 193

Process Control Instructions
Factor REAL
AtuneStart BOOL
AtuneUseModel BOOL
AtuneAbort BOOL
Output Data Type
Parameters
EnableOut BOOL
CVEU REAL
CV REAL
DeltaCV REAL
CVInitializing BOOL
CVHAlarm BOOL
CVLAlarm BOOL
CVROCPosAlarm BOOL
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Non-integrating model approximation
factor. Only used for integrating process
types.
Start Autotune request. Set True to initiate
auto tuning of the function block. Ignored
when IMC is not in Manual mode. The
function block will reset this parameter to
FALSE.
Use Autotune model request. Set True to
replace the current model parameters with
the calculated Autotune model
parameters. The function block sets the
input parameter to FALSE.
Abort Autotune request. Set True to abort
the auto tuning of the IMC function block.
The function block sets input parameter to
FALSE.
Description
Indicates if instruction is enabled. Cleared
to false if CVEU overflows.
Scaled control variable output. Scaled by
using CVEUMax and CVEUMin, where
CVEUMax corresponds to 100% and
CVEUMin corresponds to 0%. This output is
typically used to control an analog output
module or a secondary loop.
CVEU = (CV * CVEUSpan / 100) + CVEUMin
CVEU span calculation: CVEUSpan = (
CVEUMax − CVEUMin )
Control variable output. This value will
always be expressed as 0...100%. CV is
limited by CVHLimit and CVLLimit when in
Auto or CascadeRatio mode or Manual
mode if CVManLimiting is TRUE; otherwise
limited by 0 and 100%.
Difference between the Current CV and the
previous CV (Current CV - previous CV).
Initialization mode indicator. Set TRUE
when CVInitReq or function block FirstScan
are TRUE, or on a TRUE to FALSE transition
of CVFault (bad to good). CVInitializing is
set FALSE after the function block has been
initialized and CVInitReq is no longer TRUE.
CV high alarm indicator. TRUE when the
calculated value for CV > 100 or CVHLimit.
CV low alarm indicator. TRUE when the
calculated value for CV < 0 or CVLLimit.
CV rate of change alarm indicator. TRUE
when the calculated rate of change for CV
exceeds CVROCPosLimit.
Chapter 1
Default = 100
Default = FALSE
Default = FALSE
Default = FALSE
Valid and
Default Values
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