NEG   -

Operator - Performs an integer negation of the input.

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 *)