Installation manual

Publication 1747-RM001G-EN-P - November 2008
9-16 Proportional Integral Derivative Instruction
Scaled Process Variable (SPV)
The SPV (Scaled Process Variable) is the analog input variable. If scaling is
enabled, the range is the minimum scaled value (SMIN) to maximum scaled
value (SMAX).
If the SPV is configured to be read in engineering units, then this parameter
corresponds to the value of the process variable (PV) in engineering units.
Setpoint Maximum Scaled (SMAX)
If the SPV is read in engineering units, then the SMAX (Setpoint Maximum)
parameter corresponds to the value of the setpoint in engineering units when
the control input is at its maximum value.
Table 9.27 Scaled Process Variable Parameter
Input
Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
SPV - Scaled
Process Variable
Word 14 word (INT) 0 to 16383 control read/write
Table 9.28 Setpoint Maximum Scaled Parameter
Input
Parameter
Descriptions
Address Data
Format
Range Type User
Program
Access
SMAX -
Maximum
Scaled
Word 7 word
(INT)
-32,767 to
+32,767
(1)
(1)
SLC 5/02 valid range is -16382 to +16383.
control read/write