2 flexlogic rules – GE Industrial Solutions Entellisys 4.0 System User Manual User Manual
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FlexLogic™
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11
The characteristics of the logic gates are found in Table 11-4.
The latch logic operation is described in Table 11-5.
11.2 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 (e.g., “TIMER 1”) or virtual output assignment (e.g., “= Virtual Output 1”) may
only be used once. If this rule is broken, a syntax error is declared.
Table 11-4 Gate characteristics
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'
Table 11-5 Latch operation table
LATCH TYPE
LATCH SET
LATCH RESET
LATCH OUTPUT
Reset
Dominant
ON
OFF
ON
OFF
OFF
Previous State
ON
ON
OFF
OFF
ON
OFF