GE 845 Instruction Manual page 470

FLEXLOGIC
4–342
TYPE SYNTAX
Logic gate NOT
OR(2)↓ OR(16)
AND(2)↓ AND(16)
NOR(2)↓ NOR(16)
NAND(2)↓ NAND(16) 2 input NAND gate↓ 16
XOR(2)
LATCH (S,R)
Timer TIMER 1↓ TIMER 32 Timer set with
Assign virtual output = Virt Op 1↓ = Virt
Op 32
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
GATES NUMBER OF INPUTS
NOT 1
OR 2 to 16
AND 2 to 16
NOR 2 to 16
NAND 2 to 16
XOR 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.
DESCRIPTION
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
input NAND gate
2 input Exclusive OR gate Operates on the 2
Latch (set, reset): reset-
dominant
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.
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'
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
NOTES
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.
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