model 2704 controller installation and operation handbook - Soliton

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Input Operators 2704 Controller 11. Chapter 11 Input Operators 11.1. WHAT ARE INPUT OPERATORS The 2704 controller can have three control loops. Each loop can be independently configured to the process to be controlled. This has been described in Chapters 9 and 10 for PID, Cascade, Ratio, Override, Humidity Control, etc. It is also possible to apply custom linearisation to the inputs of each loop. This is a 16 point straight line linearisation and the parameters can be made available at Levels 1, 2 and 3 so that scaling can be carried out during commissioning. Custom linearisation is achieved under three page headers in the controller. Also included in this section are parameters which allow you to switch inputs between different thermocouple types or between a thermocouple and pyrometer when the process is a high temperature furnace. The page headers are: INPUT OPERS (Cust Lin 1 Page) INPUT OPERS (Cust Lin 2 Page) INPUT OPERS (Cust Lin 3 Page) INPUT OPERS (Switch 1 Page) INPUT OPERS (Monitor 1 Page) BCD INPUT These parameters set up the custom linearisation for input 1 These parameters set up the custom linearisation for input 2 These parameters set up the custom linearisation for input 3 These parameters provide switch over between thermocouple types or pyrometer Logs maximum and minimum, counts time above threshold To select a numerical value from an external BCD switch The Input Operators page is only available if Input Operators has been enabled in configuration level. This is described in the Engineering Handbook, Part No. HA026933. Note: In addition to linearising the controller inputs channels, it is equally valid to customise other sources such as Output Channels. This allows you, for example, to compensate for non linear control valve characteristics. 11-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Input Operators 11.2. CUSTOM LINEARISATION The linearisation uses a 16 point straight line fit. Figure 11.1 shows an example of a curve to be linearised and is used to illustrate the terminology used for the parameters found in the INPUT OPERS (Cust Lin1 Page). Output Hi Terminated search Output 2( to 15) Output Lo Ignored data points Input Lo Input 2( to 15) Input Hi Figure 11-1: Linearisation Example Notes: 1. The linearisation block works on rising inputs/rising outputs or rising inputs/falling outputs. It is not suitable for outputs which rise and fall on the same curve. 2. Input Lo/Output Lo and Input Hi/Output Hi are entered first to define the low and high points of the curve. It is not necessary to define all 15 intermediate points if the accuracy is not required. Points not defined will be ignored and a straight line fit will apply between the last point defined and the Input Hi/Output Hi point. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 11-3
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2704 Controller Contents MODEL 2704
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2704 Controller Introduction ➃
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2704 Controller Introduction 1.4.1.
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2704 Controller Appendix A A. APPEN
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model 2704 controller installation and operation handbook - Soliton

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