Inputs
IN : DINT Integer value
Outputs
Q : DINT Integer negation of the input
Truth table (examples)
| IN | Q |
|---|---|
| 0 | 0 |
| 1 | -1 |
| -123 | 123 |
Remarks
- In FBD
"Function block diagram"
A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks and FFLD language, the block "NEG" can be used. - In FFLD language, the operation is executed only if the input rung (EN) is TRUE. The output rung (ENO) keeps the same value as the input rung.
- This feature is not available in IL "Instruction list"
This is a low-level language and resembles assembly language. In ST "Structured text"
A high-level language that is block structured and syntactically resembles Pascal language, "-" can
be followed by a complex Boolean expression between parentheses.
ST Language
Q := -IN;
Q := - (IN1 + IN2);
FBD Language
FFLD Language
(* The negation is executed only if EN is TRUE *)
(* ENO keeps the same value as EN *)
