IN1 : BOOL First Boolean input
IN2 : BOOL Second Boolean input
Q : BOOL Exclusive OR of all inputs
| IN1 | IN2 | Q |
|---|---|---|
|
0 |
0 |
0 |
|
0 |
1 |
1 |
|
1 |
0 |
1 |
|
1 |
1 |
0 |
The block is called "=1" 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 languages. In IL"Instruction list" This is a low-level language and resembles assembly language, the XOR instruction performs an exclusive OR between the current result and the operand. The current result must be Boolean. The XORN instruction performs an exclusive between the current result and the Boolean negation of the operand.
Q := IN1 XOR IN2;
Q := IN1 XOR IN2 XOR IN3;
(* First input is the rung. The rung is the output *)
Op1: FFLD IN1
XOR IN2
ST Q (* Q is equal to: IN1 XOR IN2 *)
Op2: FFLD IN1
XORN IN2
ST Q (* Q is equal to: IN1 XOR (NOT IN2) *)
See also
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