Rockwell Automation 1769-BOOLEAN Compact I/O Module Reference Manual - Manual (Page 16)

Publication 1769-RM016A-EN-P - July 2006
16 Module Operation
Variations of Boolean Expressions
Operands
The operands in each output's Boolean expression can be configured to be
one of the following.
• None (default)
• Current state of one of the module's eight, real inputs
• Inverted, current state of one of the module's eight, real inputs
• Current state of one of the module's eight, virtual inputs (controlled by
the user program via the module's output data file)
• Inverted, current state of one of the module's eight, virtual inputs
Refer to Chapter 3, Module Data, Status, and Configuration on page 41, for
details on configuring the Boolean expression operands.
Operators
The operators in each output Boolean expression can be configured to be one
of the following (the operator's effect on a pair of operands is described).
Boolean Expression and the Related Operator Effect
Refer to Chapter 3, Module Data, Status, and Configuration on page 41, for
details on configuring the Boolean expression operators.
Variation Description
Null All operands and operators assigned a value of “None”.
A Only the first operand assigned a non-default value, all other
operands and all operators assigned a value of “None”.
A x B Only the first two operands and the first operator assigned a
non-default value, final operand and final operator assigned
a value of “None”
(A x B) y C All operands and operators assigned non-default values)
Expression Operator Effect
None Default, no logical operation performed.
OR If either operand in TRUE, the result is TRUE.
AND Both operands must be TRUE for the result to be TRUE.
XOR Exclusive - OR, one operand must be TRUE and the other
FALSE for the result to be TRUE.