Description
You can use the "Return fraction" instruction to determine the decimal places of the value at the IN input. The result of the query is stored at output OUT and can be queried there. If the input IN has e.g. the value 1.125, the output OUT has the value 0.125.
The enable output ENO has the signal state "0" if one of the following conditions applies:
-
Enable input EN has the signal state "0".
-
Errors occur during the execution of the instruction, for example there is no valid floating-point number at the input.
Parameters
The following table shows the parameters of the "Return fraction" instruction:
|
Parameters |
Declaration |
Data type |
Memory area |
Description |
|
|---|---|---|---|---|---|
|
S7-1200 |
S7-1500 |
||||
|
EN |
Input |
BOOL |
I, Q, M, D, L or constant |
I, Q, M, D, L, T, C or constant |
Enable input |
|
ENO |
Output |
BOOL |
I, Q, M, D, L |
I, Q, M, D, L |
Enable output |
|
IN |
Input |
Floating-point numbers |
I, Q, M, D, L, P, or constant |
I, Q, M, D, L, P, or constant |
Input value, whose decimal places are to be determined. |
|
OUT |
Output |
Floating-point numbers |
I, Q, M, D, L, P |
I, Q, M, D, L, P |
Decimal places of the input value at input IN |
You can select the data type of the instruction from the "???" drop-down list of the instruction box.
You can find additional information on valid data types under "See also".
Example
The following example shows how the instruction works:
The following table shows how the instruction works using specific operand values:
|
Parameters |
Operand |
Value |
|---|---|---|
|
IN |
Tag_Value |
1.125 |
|
OUT |
Tag_Result |
0.125 |
If the operands "TagIn_1" and "TagIn_2" have signal state "1", the instruction is started. The decimal places from the value of operand "Tag_Value" are copied to operand "Tag_Result". If the instruction is executed without errors, the enable output ENO has the signal state "1" and the "TagOut" output is set.