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5.5 FLEXLOGIC™
5.
Following the procedure outlined, start with parameter 99, as follows:
99: The final output of the equation is virtual output 3, which is created by the operator "= Virt Op n". This parameter is
therefore "= Virt Op 3."
98: The gate preceding the output is an AND, which in this case requires two inputs. The operator for this gate is a 2-
input AND so the parameter is "AND(2)". Note that FlexLogic™ rules require that the number of inputs to most
types of operators must be specified to identify the operands for the gate. As the 2-input AND will operate on the
two operands preceding it, these inputs must be specified, starting with the lower.
97: This lower input to the AND gate must be passed through an inverter (the NOT operator) so the next parameter is
5
"NOT". The NOT operator acts upon the operand immediately preceding it, so specify the inverter input next.
96: The input to the NOT gate is to be contact input H1c. The ON state of a contact input can be programmed to be
set when the contact is either open or closed. Assume for this example the state is to be ON for a closed contact.
The operand is therefore "Cont Ip H1c On".
95: The last step in the procedure is to specify the upper input to the AND gate, the operated state of digital element 2.
This operand is "DIG ELEM 2 OP".
Writing the parameters in numerical order can now form the equation for virtual output 3:
[95] DIG ELEM 2 OP
[96] Cont Ip H1c On
[97] NOT
[98] AND(2)
[99] = Virt Op 3
It is now possible to check that this selection of parameters will produce the required logic by converting the set of parame-
ters into a logic diagram. The result of this process is shown below, which is compared to the logic for virtual output 3 dia-
gram as a check.
6.
Repeating the process described for virtual output 3, select the FlexLogic™ parameters for Virtual Output 4.
99: The final output of the equation is virtual output 4 which is parameter "= Virt Op 4".
98: The operator preceding the output is timer 2, which is operand "TIMER 2". Note that the settings required for the
timer are established in the timer programming section.
5-134
01
02
03
04
05
97
98
99
Figure 5–52: FLEXLOGIC™ WORKSHEET
FLEXLOGIC ENTRY n:
95
DIG ELEM 2 OP
FLEXLOGIC ENTRY n:
96
Cont Ip H1c On
FLEXLOGIC ENTRY n:
97
NOT
FLEXLOGIC ENTRY n:
98
AND (2)
FLEXLOGIC ENTRY n:
99
=Virt Op 3
Figure 5–53: FLEXLOGIC™ EQUATION FOR VIRTUAL OUTPUT 3
T60 Transformer Protection System
827029A1.VSD
VIRTUAL
AND
OUTPUT 3
827030A2.VSD
5 SETTINGS
GE Multilin
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