User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDE4.22 Multiplexer blockThis ‘Toolkit’ option block selects one of eight analogue inputs to appear at its output.Multiplexer.1High LimitLow LimitFall Back StrategyFall Back ValueInput SelectorInput 1Input 2Input 3Input 8PV OutStatusResolution100000000.0-100000000.0Clip bad0.0Input 10.00.00.00.00Ok0Figure 4.22 Multiplexer block configuration4.22.1 Configuration parametersHigh Limit The high limit for input, output and fallback values. Minimum value is Low Limit.Low LimitThe low limit for input and fallback values. Maximum value is High Limit.Fallback Strategy Clip Bad: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the outputvalue is set to the appropriate limit, and the status is set to ‘Bad’. If the input signal iswithin the limits, but its status is bad, the output is set to the Fallback value.Clip Good: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the outputvalue is set to the appropriate limit, and the status is set to ‘Good’. If the input signal iswithin the limits, but its status is bad, the output is set to the Fallback value.Fall Bad: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the outputvalue is set to the Fallback value, and the status is set to ‘Bad’Fall Good: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the outputvalue is set to the Fallback value, and the status is set to ‘Good’Upscale: If the input status is bad, or if the input signal is above ‘High Limit’ or below‘Low Limit’, the output value is set to the High limit.Downscale: If the input status is bad, or if the input signal is above ‘High Limit’ or below‘Low Limit’, the output value is set to the Low limit.Fallback Value The value to be adopted by the output, under error conditions, if ‘Fallback Status’ is setto ‘Fall Good’ or ‘Fall Bad’.Input Selector Selects which of the eight inputs is presented at the output. When wired to a suitableparameter, Input Selector becomes read only. Input 1 is selected for an Input Selectorvalue of 1, Input 2 for a value of 2 and so on. Input Selector values greater than 8 areignored. If not wired, the user may select the required input using the scroll keys.Input 1 to 8 Wired to the relevant analogue inputs.PV OutThe output from the multiplexer block.StatusIndicates the status of the operation as ‘Ok’ or ‘Error’.Resolution The number of decimal places for the output value (maximum = 6)Page 162HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDE4.23 MATH (2 INPUT)This ‘Toolkit’ option block allows one of a number of operations to be carried out using two input valueswhich may be analogue or digital in nature. Either or both of the inputs can be scaled, using a ‘Multiplier’.Input 1Input 1 MultiplierInput 2Input 2 MultiplierMath (2 input)blockFigure 4.23a Block schematicOutputMath (2 input).1OperationInput 1 MultiplierInput 2 MultiplierUnitsResolutionLow LimitHigh limitFallback StrategyFallback ValueInput SelectorInput 1Input 2OutputStatusSel11.01.0DegC20.00 DegC50.00 DegCClipGood0.0 DegCInput130.28 °C1.4030.28 DegCOkFigure 4.23b Block configuration (typical)4.23.1 ParametersOperation Add Output = Input 1 + Input 2Subtract Output = Input 1 - Input 2Multiply Output = Input 1 x Input 2Divide Output = Input 1 ÷ Input 2Abs Diff Output = the difference between Input 1 and Input 2, ignoring signSelect Max Output = whichever is the larger of Input 1 or Input 2Select Min Output = whichever is the smaller of Input 1 or Input 2Hot Swap Output = Input 2 if Input 1 is ‘Bad’; otherwise Output = Input 1Sample/Hold Output tracks Input 1 whilst Input 2 = 1. Output value is held whilst Input2 = 0 (See Section 4.23.2, below, for more details)Power* Output = Input 1 to the power of Input 2. (Output = Input 1 Input 2 )Square Root Output = √Input 1 (Input 2 ignored)Log Base 10 Output = Log 10 Input 1 (Input 2 ignored)Log Base e Output = Ln Input 1 (Input 2 ignored)Exponential Output = e Input1 (Input 2 ignored)10 to the X Output = 10 Input 1 (Input 2 ignored)Sel1Output = Input 1 if Input Selector = Input1Output = Input 2 if Input Selector = Input2* Note... For this implementation:0 to the power 0 = 1.Negative values raised to any power result in bad status.0 raised to a negative power results in bad status.HA030554Issue 7 Nov 12Page 163
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User Guide - Eurotherm Ltda

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