| Function Name |
SUB (Subtract) |
|---|---|
|
ST Operator |
- |
|
Description |
Outputs the result of Input 1 minus Input 2. |
|
Arguments |
Input 1 {ANY_MAGNITUDE} Input 2 {ANY_MAGNITUDE For more information on the data types for the inputs and outputs, see Data Type Hierarchy. |
|
Returns |
Output {Same data type as input} The Output = Input 1 - Input 2. |
Example:
Function Block Diagram - SUB:
The output is the result of the top input minus the bottom input. So, if the top input is 7 and the bottom input is 5, the output is 2 (7-5=2).
ST Program - SUB:
The SUB function is used to provide the result of Input 1 minus Input 2:
- Output := Input 1 - Input 2;
Where Output, Input 1 and Input 2 are defined as variables earlier in the ST program. In this case, let's assume Input 1 is 17 and Input 2 is 10. The SUB function returns 7 as 17 -10 = 7.
The same effect can be achieved by using the following syntax:
- Output := SUB (Input 1, Input 2);