Allen-Bradley LOGIX 5000 Reference Manual page 127

Process Control Instructions
InEUMax REAL
InEUMin REAL
Limiting BOOL
Output Parameter Data Type
EnableOut BOOL
Out REAL
MaxAlarm BOOL
MinAlarm BOOL
Status DINT
InstructFault (Status.0) BOOL
InRawRangeInv (Status.1) BOOL
Description
Use the SCL instruction with analog input modules that do not support scaling to
a full resolution floating point value.
For example, the 1771-IFE module is a 12-bit analog input module that supports
scaling only in integer values. If you use a 1771-IFE module to read a flow of 0-100
gallons per minute (gpm), you typically do not scale the module from 0-100
because that limits the resolution of the module. Instead, use the SCL instruction
and configure the module to return an unscaled (0-4095) value, which the SCL
instruction converts to 0-100 gpm (floating point) without a loss of resolution.
This scaled value could then be used as an input to other instructions.
The SCL instruction uses this algorithm to convert unscaled input into a scaled
value:
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
The scaled value of the input corresponding to
InRawMax.
Valid = any real value
Default = 0.0
The scaled value of the input corresponding to
InRawMin.
Valid = any real value
Default = 0.0
Limiting selector. If true, Out is limited to
between InEUMin and InEUMax.
Default is false.
Description
Indicates if instruction is enabled. Cleared to false
if Out overflows.
The output that represents scaled value of the
analog input.
Valid = any real value
Default = InEUMin
The above maximum input alarm indicator. This
value is set to true when In> InRawMax.
The below minimum input alarm indicator. This
value is set to true when In < InRawMin.
Status of the function block.
The instruction detected one of the following
execution errors. This is not a minor or major
controller error. Check the remaining status bits
to determine what occurred.
InRawMin InRawMax.
Chapter 1
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