# Flexlogic Rules - GE L90 Instruction Manual

Line current differential system.

CHAPTER 5: SETTINGS
Table 5-25: FlexLogic gate characteristics
Gates
Number of inputs
NOT
1
OR
2 to 16
AND
2 to 16
NOR
2 to 16
NAND
2 to 16
XOR
2
Table 5-26: FlexLogic operators
Type
Syntax
Editor
INSERT
DELETE
End
END
One-shot
POSITIVE ONE SHOT
NEGATIVE ONE SHOT
DUAL ONE SHOT
Logic
NOT
gate
OR(2)
OR(16)
AND(2)
AND(16)
NOR(2)
NOR(16)
NAND(2)
NAND(16)
XOR(2)
LATCH (S,R)
Timer
TIMER 1
TIMER 32
Assign
= Virt Op 1
virtual
output
= Virt Op 96

## 5.6.2 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 that 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") can be used once
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Output is '1' (= ON) if...
input is '0'
any input is '1'
all inputs are '1'
all inputs are '0'
any input is '0'
only one input is '1'
Description
Insert a parameter in an equation list
Delete a parameter from an equation list
The first END encountered signifies the last entry in
the list of processed FlexLogic parameters
One shot that responds to a positive going edge
One shot that responds to a negative going edge
One shot that responds to both the positive and
negative going edges
Logical NOT
2 input OR gate
16 input OR gate
2 input AND gate
16 input AND gate
2 input NOR gate
16 input NOR gate
2 input NAND gate
16 input NAND gate
2 input Exclusive OR gate
Latch (set, reset): reset-dominant
Timer set with FlexLogic timer 1 settings
Timer set with FlexLogic timer 32 settings
Assigns previous FlexLogic operand to virtual
output 1
Assigns previous FlexLogic operand to virtual
output 96
Notes
A 'one shot' refers to a single input gate that
generates a pulse in response to an edge on
the input. The output from a 'one shot' is
True (positive) for only one pass through the
FlexLogic equation. There is a maximum of
64 'one shots.'
Operates on the previous parameter
Operates on the 2 previous parameters
Operates on the 16 previous parameters
Operates on the 2 previous parameters
Operates on the 16 previous parameters
Operates on the 2 previous parameters
Operates on the 16 previous parameters
Operates on the 2 previous parameters
Operates on the 16 previous parameters
Operates on the 2 previous parameters
The parameter preceding LATCH(S,R) is the
reset input. The parameter preceding the
reset input is the set input.
The timer is started by the preceding
parameter. The output of the timer is
TIMER #.
The virtual output is set by the preceding
parameter
FLEXLOGIC
5
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