α
2
Simple Application Controllers
Function Blocks 6
6 - 7
6.3
Boolean block
The function block creates a logical operation using Boolean algebra consisting of AND, OR,
NAND, XOR and NOT gates. It is possible to express the Logic functions in the form of an
equation. Refer to Chapter 5 for detailed information concerning Boolean Logic operation.
Table 6.3: Boolean Function Block
Table 6.3.1: Boolean expressional data
1 ) Boolean Operation
Function
Set Item
Description
1,2,3,4
Numbered Input pins for boolean operation to control
FB
User-defined logical boolean operation
Output
The output is controlled directly from the result of the boolean
operation involving the numbered input pins 1,2,3,4.
Item
Display
Description
AND
∗
Intersection
OR
+
Disjunction
XOR
^
XOR
NOT
!
NOT
(
(
Left parenthesis
)
)
Right parenthesis
1
1
Signal connected to Input pin 1
2
2
Signal connected to Input pin 2
3
3
Signal connected to Input pin 3
4
4
Signal connected to Input pin 4
O
O
Output signal
=
=
Equal sign signal
0 0
0
1
L
B
O
2
3
4
P
01
BL
Output
1
2
3
1
2
3
O = 1
2
+
3
AND OR
*
