Allen-Bradley LOGIX 5000 Reference Manual page 187

Process Control Instructions
SPHLimit REAL
SPLLimit REAL
UseRatio BOOL
RatioProg REAL
RatioOper REAL
RatioHLimit REAL
RatioLLimit REAL
CVFault BOOL
CVInitReq BOOL
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
SP high limit value, scaled in PV units.
If SPHLimit < SPLLimit or SPHLimit >
PVEUMax, set bit in Status.
SP low limit value, scaled in PV units.
If SPLLimit < PVEUMin, or SPHLimit <
SPLLimit, set bit in Status and limit SP by
using the value of SPLLimit.
Allow Ratio control permissive. Set TRUE to
enable ratio control when in CascadeRatio
mode.
Ratio Program multiplier, no units (for
example, scalar). Ratio and RatioOper are
set to this value when in Program control.
If RatioProg or RatioOper < RatioLLimit or
> RatioHLimit, set bit in Status and limit
value used for Ratio.
Ratio Operator multiplier, no units (for
example, scalar). Ratio is set to this value
when in Operator control.
If RatioProg or RatioOper < RatioLLimit or
> RatioHLimit, set bit in Status and limit
value used for Ratio.
Ratio high limit value, no units (for
example, scalar). Limits the value of Ratio
obtained from RatioProg or RatioOper.
If RatioLLimit < 0, set bit in Status and
limit to zero. If RatioHLimit < RatioLLimit,
set bit in Status and limit Ratio by using the
value of RatioLLimit.
Ratio low limit value, no units (for
example, scalar). Limits the value of Ratio
obtained from RatioProg or RatioOper.
If RatioLLimit < 0, set bit in Status and
limit to zero. If RatioHLimit < RatioLLimit,
set bit in Status and limit Ratio by using the
value of RatioLLimit.
Control variable bad health indicator. If
CVEU controls an analog output, then
CVFault will normally come from the
analog output's fault status.
If CVFault is TRUE, it indicates an error on
the output module, set bit in Status.
CV initialization request. While TRUE, set
CVEU to the value of CVInitValue. This
signal will normally be controlled by the In
Hold status on the analog output module
controlled by CVEU or from the InitPrimary
output of a secondary IMC loop.
Chapter 1
Valid = SPLLimit to PVEUMax
Default = 100.0
Valid = PVEUMin to SPHLimit
Default = 0.0
Default = FALSE
Valid = RatioLLimit to
RatioHLimit
Default = 1.0
Valid = RatioLLimit to
RatioHLimit
Default = 1.0
Valid = RatioLLimit to
maximum positive float
Default = 1.0
Valid = 0.0 to RatioHLimit
Default = 1.0
Default = FALSE
FALSE = Good Health
Default = FALSE
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