model 2704 controller installation and operation handbook - Soliton

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Analogue Operators 2704 Controller 14. Chapter 14 Analogue Operators 14.1. WHAT ARE ANALOGUE OPERATORS? Analogue Operators allow the controller to perform mathematical operations on two input values. These values can be sourced from any available parameter including Analogue Values, User Values and Digital Values. Each input value can be scaled using a multiplying factor or scalar as shown in Figure 14.1. The parameters to use, the type of calculation to be performed and the acceptable limits of the calculation are determined in Configuration level (see 2704 Engineering Handbook HA026933). In access level 3 you can change values of each of the scalars. In Access levels 2 & 3, provided the Analogue Operators page has been promoted, the input values and the result of the calculation can be read. The Analogue Operators page is only available if Analogue and Logic Operators have been enabled in configuration level. This is described in the 2704 Engineering Handbook. Up to 24 separate operations can be performed and a separate page header is provided for each one. Analogue input 1 Input 1 Scalar Analogue input 2 Input 2 Scalar Analogue operator See 14.1.1. Output Value (result of calculation) Figure 14-1: Analogue Operators 14-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Analogue Operators 14.1.1. Analogue Operations The following operations can be performed: Off The selected analogue operator is turned off Add The output result is the addition of Input 1 and Input 2 Subtract The output result is the difference Input 1 and Input 2 where Input 1 > Input 2 Multiply The output result is the multiplication of Input 1 and Input 2 Divide The output result is Input 1 divided by Input 2 Absolute Difference The output result is the absolute difference between Input 1 and Input 2 Select Max The output result is the maximum of Input 1 and Input 2 Select Min The output result is the minimum of Input 1 and Input 2 Hot Swap Input 1 appears at the output provided input 1 is ‘good’. If input 1 is ‘bad’ then input 2 value will appear at the output. An example of a bad input occurs during a sensor break condition. Sample and Hold Normally input 1 will be an analogue value and input B will be digital. The output tracks input 1 when input 2 = 1 (Sample). The output will remain at the current value when input 2 = 0 (Hold). Input 2 can be an analogue value and must change from 0 to 100% to provide a sample and hold at the output. Power The output is the value at input 1 raised to the power of the value at input 2. I.e. input 1 input 2 Square Root The output result is the square root of Input 1. Input 2 has no effect. Log The output result is the logarithm (base 10) of Input 1. Input 2 has no effect Ln The output result is the logarithm (base n) of Input 1. Input 2 has no effect Exp The output result is the exponential of Input 1. Input 2 has no effect 10x The output result is 10 raised to the power of Input 1 value. I.e. 10 input 1 . Input 2 has no effect Select Logic 1 Input 1 or input 2 is switched to the output depending upon the state of up to Select Logic 32 the logic input. If logic input is true input 1 is switched through to the output. If logic input is false input 2 is switched through to the output. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 14-3
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2704 Controller Contents MODEL 2704
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