GE T60, Instruction Manual

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5-168 T60 Transformer Protection System GE Multilin
5.5 FLEXLOGIC 5 SETTINGS
5
5.5.2 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 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.
5.5.3 FLEXLOGIC EVALUATION
Each equation is evaluated in the ascending order in which the parameters have been entered.
FlexLogic provides built-in latches that by definition have a memory action, remaining in the set state after the set
input has been asserted. These built-in latches are reset dominant, meaning that if logical "1" is applied to both set
and reset entries simultaneously, then the output of the latch is logical "0." However, they are volatile, meaning that
they reset upon removal of control power.
When making changes to FlexLogic entries in the settings, all FlexLogic equations are re-compiled whenever any
new FlexLogic entry value is entered, and as a result of the re-compile all latches are reset automatically.
Table 5–22: FLEXLOGIC OPERATORS
TYPE SYNTAX DESCRIPTION NOTES
Editor INSERT Insert a parameter in an equation list.
DELETE Delete a parameter from an equation list.
End END The first END encountered signifies the last entry in
the list of processed FlexLogic parameters.
One-shot POSITIVE ONE SHOT One shot that responds to a positive going edge. 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’.
NEGATIVE ONE
SHOT
One shot that responds to a negative going edge.
DUAL ONE SHOT One shot that responds to both the positive and
negative going edges.
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 96
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
NOTE