GE D90 Plus Instruction Manual page 433

CHAPTER 8: AUTOMATION
Automation logic rules
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 349: Automation logic configuration settings
A graphical representation of the automation logic can be displayed by clicking on the
View button at the top of the equation.
Figure 350: Typical automation logic display
When forming an automation logic equation, the sequence in the linear array of
parameters must follow these general rules.
1. There are two types of operators: logic operators and math operators.
2. Logic operands must precede the logic operator that uses the operands as inputs.
3. Logic operators have only one output. The output of an operator must be used to
create a virtual output if it is to be used as an input to two or more operators.
4. Assigning the output of a logic operator to a virtual output terminates the equation.
5. A timer operator (for example
1) may only be used once. If this rule is broken, a syntax error will be declared.
Virt Op
6. Math operands must precede the math operator that uses the operands as inputs.
7. Math operators have only one output. The output of a math operator must be used to
create a virtual analog if it is to be used as an input to two or more operators.
1) or virtual output assignment (for example,
Aut Timer
AUTOMATION LOGIC
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