GE Industrial Solutions Entellisys System User Manual - Manual (Page 156)

FlexLogic™ 156
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