# Flexlogic Rules; Flexlogic Evaluation - GE B90 UR Series Instruction Manual

Low impedance bus differential system.

5.4 FLEXLOGIC
Table 5–9: FLEXLOGIC OPERATORS
TYPE
SYNTAX
Editor
INSERT
DELETE
End
END
One-shot
POSITIVE ONE SHOT One shot that responds to a positive going edge.
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)
5
LATCH (S,R)
Timer
TIMER 1
TIMER 32
Assign
= Virt Op 1
virtual
output
= Virt Op 96
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.
Each equation is evaluated in the order in which the parameters have been entered.
FlexLogic provides latches which by definition have a memory action, remaining in the set state after the set input
has been asserted. However, they are volatile; that is, they reset on the re-application of control power.
NOTE
When making changes to settings, all FlexLogic equations are re-compiled whenever any new setting value is
entered, so all latches are automatically reset. If it is necessary to re-initialize FlexLogic during testing, for example,
it is suggested to power the unit down and then back up.
5-86
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 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.
B90 Low Impedance Bus Differential System
5 SETTINGS
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

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