Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 37)

5Ć5
Table 5.3 Ć Truth Table for Boolean Operators
A B A AND B A OR B A XOR B NOT A
0 0 0 0 0 1
0 1 0 1 1 1
1 0 0 1 1 0
1 1 1 1 0 0
1= TRUE; 0 = FALSE
The AND boolean operator has a higher precedence than the OR or
XOR operators, which have equal precedence. Thus, in a boolean
expression, the AND operator will be evaluated before the OR
operator. The NOT operator is always applied immediately to the
expression (which is the same as the unary minus operator). The
following examples show a boolean expression and the order of
evaluation of the operators:
A@ = B@ OR C@ AND D@
1. C@ AND D@
2. B@ OR [C@ AND D@]
A@=B@ AND NOT C@ OR D@ AND A@
1. NOT C@
2. B@ AND [NOT C@]
3. D@ AND A@
4. [B@ AND (NOT C@)] OR [D@ AND A@]
A@ = NOT(A@ OR B@AND C@) OR C@ AND NOT D@ OR
B@
1. B@ AND C@
2. A@ OR [B@ AND C@]
3. NOT [A@ OR (B@ AND C@)]
4. NOT D@
5. C@ AND [NOT D@]
6. [NOT (A@ OR (B@ AND C @))] OR [C@ AND (NOT D@)]
7. [(NOT (A@ OR (B@ AND C@))) OR (C@ AND (NOT D@))] OR
B@
Boolean values can be combined with integer values by using either
boolean or arithmetic operators. In combining the two data types,
note the following guidelines:
D When a boolean value is combined with an integer value using
boolean operators or arithmetic operators, the result is always in
integer.