CHAPTER 5: SETTINGS FLEXLOGICC70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 5-1475Figure 5-65: Logic example with virtual outputs2. Prepare a logic diagram for the equation to produce virtual output 3, as this output is used as an operand in the virtualoutput 4 equation (create the equation for every output that is used as an operand first, so that when these operandsare required they already have been evaluated and assigned to a specific virtual output). The logic for virtual output 3is shown as follows with the final output assigned.Figure 5-66: Logic for virtual output 33. Prepare a logic diagram for virtual output 4, replacing the logic ahead of virtual output 3 with a symbol identified asvirtual output 3, shown as follows.Figure 5-67: Logic for virtual output 44. Program the FlexLogic equation for virtual output 3 by translating the logic into available FlexLogic parameters. Theequation is formed one parameter at a time until the required logic is complete. It is generally easier to start at theoutput end of the equation and work back towards the input, as shown in the following steps. It is also recommendedLatchXORANDResetSetDigital element 1state = PickupOR #2 Virtual output 4OR #1(800 ms)Timer 1Time delayon pickup(200 ms)Timer 2Time delayon dropoutVirtual output 1state = On827026A2.CDRVirtual output 3Virtual output 2state = OnVirtual input 1state = OnDigital element 1state = OperatedContact input H1cstate = ClosedAND(2) Virtual output 3827027A2.CDRDigital element 2state= OperatedContact input H1cstate = ClosedLatchXORResetSetOR #2 Virtual output 4OR #1(800 ms)Timer 1Time delayon pickup(200 ms)Timer 2827028A2.CDRVirtual output 1state = OnVirtual output 2state = OnVirtual input 1state = OnDigital element 1state = PickupVirtual output 3state = OnContact input H1cstate = ClosedTime delayon dropout
