Siemens S7-1200 System Manual page 252

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Basic instructions

7.7 Conversion operations

SCALE_X parameter VALUE should be restricted to ( 0.0 <= VALUE <= 1.0 )

If parameter VALUE is less than 0.0 or greater than 1.0:

• The linear scaling operation can produce OUT values that are less than the parameter

MIN value or above the parameter MAX value for OUT values that fit within the value

range of the OUT data type. SCALE_X execution sets ENO = TRUE for these cases.

• It is possible to generate scaled numbers that are not within the range of the OUT data

type. For these cases, the parameter OUT value is set to an intermediate value equal to

the least-significant portion of the scaled real number prior to final conversion to the OUT

data type. SCALE_X execution sets ENO = FALSE in this case.

NORM_X parameter VALUE should be restricted to ( MIN <= VALUE <= MAX )

If parameter VALUE is less than MIN or greater than MAX, the linear scaling operation can

produce normalized OUT values that are less than 0.0 or greater than 1.0. NORM_X

execution sets ENO = TRUE in this case.

Result exceeds valid range for the OUT data

Parameters MAX <= MIN

Parameter VALUE = +/- INF or +/- NaN

Valid result

Intermediate result: The least-significant portion of a real

number prior to final conversion to the OUT data type.

SCALE_X: The least-significant portion of the Real number

VALUE to fill up the OUT size.

NORM_X: VALUE in VALUE data type extended to fill a

double word size.

VALUE is written to OUT

System Manual, 03/2014, A5E02486680-AG

S7-1200 Programmable controller