GE 845, Instruction Manual

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4–342 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
FLEXLOGIC CHAPTER 4: SETPOINTS
The characteristics of the logic gates are tabulated below, and the operators available in
FlexLogic™ are listed in the FlexLogic™ operators table.
Table 4-39: FlexLogic Gate Characteristics
FLEXLOGIC RULES
When forming a FlexLogic™ equation, the sequence in the linear array of parameters must
follow these general rules:
1.
Operands must precede the operator which uses the operands as inputs.
2. 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.
3. Assigning the output of an operator to a Virtual Output terminates the equation.
4. A timer operator (for example, "TIMER 1") or Virtual Output assignment (for example,
" = Virt Op 1") may only be used once. If this rule is broken, a syntax error will be
declared.
Logic gate NOT Logical NOT Operates on the previous
parameter.
OR(2)
↓
OR(16) 2 input OR gate
↓
16
input OR gate
Operates on the 2
previous parameters.
↓
Operates on the 16
previous parameters.
AND(2)
↓
AND(16) 2 input AND gate
↓
16
input AND gate
Operates on the 2
previous parameters.
↓
Operates on the 16
previous parameters.
NOR(2)
↓
NOR(16) 2 input NOR gate
↓
16
input NOR gate
Operates on the 2
previous parameters.
↓
Operates on the 16
previous parameters.
NAND(2)
↓
NAND(16) 2 input NAND gate
↓
16
input NAND gate
Operates on the 2
previous parameters.
↓
Operates on the 16
previous parameters.
XOR(2) 2 input Exclusive OR gate Operates on the 2
previous parameters.
LATCH (S,R) Latch (set, reset): reset-
dominant
The parameter preceding
LATCH(S,R) is the reset
input. The parameter
preceding the reset input
is the set input.
Timer TIMER 1
↓
TIMER 32 Timer set with
FlexLogic™ timer 1
settings.
↓
Timer set with
FlexLogic™ timer 32
settings.
The timer is started by
the preceding parameter.
The output of the timer is
TIMER #.
Assign virtual output = Virt Op 1
↓
= Virt
Op 32
Assigns previous
FlexLogic™ operand to
virtual output 1.
↓
Assigns
previous FlexLogic™
operand to virtual output
96.
The virtual output is set
by the preceding
parameter
GATES NUMBER OF INPUTS OUTPUT IS ‘1’ (= ON) IF...
NOT 1 input is ‘0’
OR 2 to 16 any input is ‘1’
AND 2 to 16 all inputs are ‘1’
NOR 2 to 16 all inputs are ‘0’
NAND 2 to 16 any input is ‘0’
XOR 2 only one input is ‘1’
TYPE SYNTAX DESCRIPTION NOTES