
847H-FB2A-RG01000 A-B Multi-Function Processor Module
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IN STOCK847H-FB2A-RG01000 A-B Multi-Function Processor Module
An expression is a tag name, equation, or comparison. To write an expression, use any of the following: • Tag name that stores the value (variable) • Number that you enter directly into the expression (immediate value) • String literal that you enter directly into the expression ( CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only) • Functions, such as: ABS, TRUNC • Operators, such as: +, -, <, >, And, Or
Follow these guidelines for writing expressions: • Use any combination of upper-case and lower-case letter. For example, these variations of "AND" are acceptable: AND, And, and. • For more complex requirements, use parentheses to group expressions within expressions. This makes the whole expression easier to read, and ensures that the expression executes in the desired sequence.
BOOL expression: An expression that produces the BOOL value of 1 (true) or 0 (false). • A bool expression uses bool tags, relational operators, and logical operators to compare values or check if conditions are true or false. For example, tag1>65. • A simple bool expression can be a single BOOL tag. • Typically, use bool expressions to condition the execution of other logic.
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