5-110 B30 Bus Differential System GE Multilin5.5 FLEXLOGIC 5 SETTINGS5Therefore, the required logic can be implemented with two FlexLogic equations with outputs of virtual output 3 and vir-tual output 4 as shown below.Figure 5–38: LOGIC EXAMPLE WITH VIRTUAL OUTPUTS2. Prepare a logic diagram for the equation to produce virtual output 3, as this output will be used as an operand in thevirtual output 4 equation (create the equation for every output that will be used as an operand first, so that when theseoperands are required they will already have been evaluated and assigned to a specific virtual output). The logic forvirtual output 3 is shown below with the final output assigned.Figure 5–39: 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 as vir-tual output 3, as shown below.Figure 5–40: 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 the out-put end of the equation and work back towards the input, as shown in the following steps. It is also recommended to listoperator inputs from bottom to top. For demonstration, the final output will be arbitrarily identified as parameter 99, andeach preceding parameter decremented by one in turn. Until accustomed to using FlexLogic, it is suggested that aworksheet with a series of cells marked with the arbitrary parameter numbers be prepared, as shown below.LATCHCONTACT INPUT H1cState=ClosedXORANDResetSetVIRTUAL OUTPUT 2State=ONVIRTUAL INPUT 1State=ONDIGITAL ELEMENT 1State=PickupDIGITAL ELEMENT 2State=OperatedOR #2 VIRTUAL OUTPUT 4OR #1(800 ms)Timer 1Time Delayon Pickup(200 ms)Timer 2Time Delayon DropoutVIRTUAL OUTPUT 1State=ON827026A2.VSDVIRTUAL OUTPUT 3CONTACT INPUT H1cState=ClosedAND(2)DIGITAL ELEMENT 2State=OperatedVIRTUAL OUTPUT 3827027A2.VSDLATCHCONTACT INPUT H1cState=ClosedXORResetSetVIRTUAL OUTPUT 2State=ONVIRTUAL INPUT 1State=ONDIGITAL ELEMENT 1State=PickupOR #2 VIRTUALOUTPUT 4OR #1(800 ms)Timer 1Time Delayon Pickup(200 ms)Timer 2Time Delayon DropoutVIRTUAL OUTPUT 3State=ONVIRTUAL OUTPUT 1State=ON827028A2.VSD
