Allen-Bradley LOGIX 5000 User Manual

Chapter 1
Process Control Instructions
70 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
CVInitValue REAL CVEU initialization value, scaled in CVEU units. When CVInitializing is true, CVEU =
CVInitValue and CV equals the corresponding percentage value. CVInitValue comes
from the feedback of the analog output controlled by CVEU or from the setpoint of a
secondary loop. Instruction initialization is disabled when CVFaulted or CVEUSpanInv is
true.
Valid = any float
Default = 0.0
CVProg REAL CV program manual value. CV equals this value when in Program Manual mode. If
CVProg < 0 or > 100, or < CVLLimit or > CVHLimit when CVManLimiting is true, the
instruction sets the appropriate bit in Status and limits the CV value.
Valid = 0.0 to 100.0
Default = 0.0
CVOper REAL CV operator manual value. CV equals this value when in Operator Manual mode. If not
Operator Manual mode, the instruction sets CVOper = CV at the end of each instruction
execution. If CVOper < 0 or > 100, or < CVLLimit or > CVHLimit when CVManLimiting
is true, the instruction sets the appropriate bit in Status and limits the CV value.
Valid = 0.0 to 100.0
Default = 0.0
CVOverride REAL CV override value. CV equals this value when in override mode. This value should
correspond to a safe state output of the PID loop. If CVOverride < 0 or >100, the
instruction sets the appropriate bit in Status and limits the CV value.
Valid = 0.0 to 100.0
Default = 0.0
CVPrevious REAL CV
n-1
value. If CVSetPrevious is set, CV
n-1
equals this value. CV
n-1
is the value of CV from
the previous execution. CVPrevious is ignored when in manual, override or hand mode
or when CVInitializing is set. If CVPrevious < 0 or > 100, or < CVLLimit or > CVHLimit
when in Auto or cascade/ratio mode, the instruction sets the appropriate bit in Status
and limits the CVn-1 value.
Valid = 0.0 to 100.0
Default = 0.0
CVSetPrevious BOOL Request to use CVPrevious. If true, CVn-1 = CVPrevious
Default is false.
CVManLimiting BOOL Limit CV in manual mode request. If Manual mode and CVManLimiting is true, CV is
limited by the CVHLimit and CVLLimit values.
Default is false.
CVEUMax REAL Maximum value for CVEU. The value of CVEU which corresponds to 100 percent CV. If
CVEUMax = CVEUMin, the instruction sets the appropriate bit in Status.
Valid = any float
Default = 100.0
CVEUMin REAL Minimum value of CVEU. The value of CVEU which corresponds to 0 percent CV. If
CVEUMax = CVEUMin, the instruction sets the appropriate bit in Status.
Valid = any float
Default = 0.0
CVHLimit REAL CV high limit value. This is used to set the CVHAlarm output. It is also used for limiting
CV when in Auto or Cascade/Ratio mode, or Manual mode if CVManLimiting is true. If
CVHLimit > 100 or < CVLLimit, the instruction sets the appropriate bit in Status. If
CVHLimit < CVLLimit, the instruction limits CV using the value of CVLLimit.
Valid = CVLLimit < CVHLimit 100.0
Default = 100.0
CVLLimit REAL CV low limit value. This is used to set the CVLAlarm output. It is also used for limiting CV
when in Auto or Cascade/Ratio mode, or Manual mode if CVManLimiting is true. If
CVLLimit < 0 or CVHLimit < CVLLimit, the instruction sets the appropriate bit in Status.
If CVHLimit < CVLLimit, the instruction limits CV using the value of CVLLimit.
Valid = 0.0 CVLLimit < CVHLimit
Default = 0.0

Allen-Bradley LOGIX 5000 Specifications

General

Brand	Allen-Bradley
Model	LOGIX 5000
Category	Controller
Language	English