E2 User's Manual Supplement: Flexible Combiner ... - icemeister.net

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monly will only be constant values, since there is usuallylittle need for variance in one-shot pulse width. However,a delay equation can be any mathematical expression(including inputs, constants, operators, or functions) thatresults in an analog value representing number of seconds.DesiredFunction5 secondpulse on DO1DO1 PulseWidth:5EquationFor outputs, setting an engineering unit determineshow it is displayed in the Flex Combiner status screen. If aunit is chosen for an output that is different from thedefault engineering unit of the same type used by the E2 inGeneral Controller Info, the chosen type is substituted forthe default type on this screen only.In other words, if AO1 is set to display in DF in theFlexible Combiner cell but the default temperature unit forthe E2 is in DC, the output value will only be displayed inDF on the Flex Combiner status screen — everywhere else(including the Flex Combiner Summary Screen) it willdisplay in DC.2 minutepulse on DO215 secondpulse widthon DO3unless the currenttime isbefore 8 a.m.,in which casethe pulsewidth is 10secondsDO2 PulseWidth00:02DO3 PulseWidthIF((TIME()
2 Building EquationsEquations are made up of different combinations offour major elements: inputs, defined in the Flexible Combinerapplication, constants such as numerical values usedin mathematical computations, operators such as plussigns (+) or greater than signs (>) used to perform basicmath functions, and functions such as if-then statementsor boolean logic (AND/OR).2.1 Input and OutputVariablesVariable NameAIx (x=inputnumber)DIx (x=inputnumber)AOx (x=outputnumber)DOx (x=outputnumber)DescriptionThe analog value of input AIx, in SIunitsThe digital state of input DIx, convertedto analog:1.0 if input is ON0.0 if input is OFFThe analog value of output AOx, in SIunitsThe digital state of output DOx, convertedto analog:1.0 if input is ON0.0 if input is OFFTable 2-1 - Input and Output Variable NamesThe most commonly used variables in an equation willbe the Flexible Combiner’s input values. These are representedin equations by their variable names, AI1-AI8 andDI1-DI8.To use input values in an equation, just enter theirnames (AI for analog input or DI for digital input, and anumber from 1 through 8 corresponding to the input number).The E2 will look for input variable names and createa link to the input’s value when parsing the equation.Analog Input Values and SI UnitsThe value of an AI input will always be equal to thecurrent input value in the E2’s internal standard (SI)units. This is important to remember because any mathematicaloperations that involve this value will use its SIunits, which may cause the equation to be wrong if you areassuming the wrong units.Example: AI1 is reading a value of 212°F. If youwanted to write an equation that added 10°F to the valueof AI1, the equation “AI1+10” would be incorrect becausethis would add 10 to the value of AI in Celsius, since E2’sSI unit for temperature is Celsius.The way to correct this would be convert the number10 to an equivalent number of degrees C (“AI1+5.6”), orelse use a type suffix so the E2 knows you want to add 10degrees (“AI1+10DDF”). Type suffixes are explained infurther detail in Section 2.2.2, Specifying a Constant’sEngineering Unit with Type Suffixes.Table 2-2 lists the SI units used by E2:Input Type Choices SI UnitTemperatureChange inTemperaturePressureChange inPressureAir VelocityLiquidVelocityVolumeFlowdegrees Fahrenheit (DF)degrees Celsius (DC)delta degrees Fahrenheit(DDF)delta degrees Celsius(DDC)inches of water (INW)centimeters of water(CMW)pounds per sq. inch (PSI)bars (BAR)kilopascals (KPA)pascals (PA)delta inches of water(DINW)delta centimeters of water(DCMW)delta pounds per sq. inch(DPSI)delta bars (DBAR)delta kilopascals (DKPA)delta pascals (DPA)feet per minute (FPM)meters per minute (MPM)meters per second (MPS)gallons per minute(GPM)liters per second (LPS)cubic feet per minute(CFM)cubic meters per second(CMS)Table 2-2 - SI Units for Analog Inputsdegrees C (DC)delta degrees C(DDC)pascals (PA)delta pascals(DPA)meters per seconds(MPS)liters per second(LPS)cubic metersper secondInput and Output Variables Input and Output Variables • 2-1
Page 1: 026-1620 Rev 0 09-15-05E2 User’s
Page 5: Table of Contents1 FLEXIBLE COMBINE
Page 9 and 10: DO1-DO8 TriggerIf any of the DO1-DO
Page 11: DesiredFunctionAND combinationof di
Page 15 and 16: unitless numbers. In other words, a
Page 17 and 18: 2.3 OperatorsOperators are symbols
Page 19 and 20: 2.4.1 Extended Math FunctionsFuncti
Page 21 and 22: 2.4.2 Extended Logical FunctionsFun
Page 23 and 24: Function Description ExamplesTANR(v
Page 25 and 26: Function Description ExamplesNEWYEA
Page 27 and 28: 3 Testing and Troubleshooting Equat
Page 29: • Press , then select “ - Overr

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