model 2704 controller installation and operation handbook - Soliton

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Standard IO 2704 Controller 17. Chapter 17 Standard IO 17.1. WHAT IS STANDARD IO? Standard IO refers to the fixed Input/Output connections as listed in Table 17-1 below. Parameters such as input/output limits, filter times and scaling of the IO can be adjusted in the Standard IO pages. 1. Scale the controller to your reference standards 2. Match the calibration of the controller to an individual transducer or sensor 3. To compensate for known offsets in process measurements These offsets can be made to parameters in the Standard IO pages. STANDARD IO (PV Input Page) (An Input Page) (AA Relay Page) (Dig IO1 Page) to (Dig IO7 Page) (Diagnostic Page) Allows access to parameters which set up the fixed Process Variable Input connected to terminals VH, VI, V+ and V-. This is, generally, the PV input for a single loop controller. Allows access to parameters which set up the fixed Analogue Input connected to terminals BA, BB and BC. This is the high level input from a remote source. Allows access to parameters which set up the fixed Relay output connected to terminals AA, AB and AC. This relay may be used as an alarm relay. a time proportioning control output or valve raise/lower.. Allows access to parameters which set up the fixed digital IO connected to terminals D1 to D7 and DC. Allows access to parameters which set up the fixed digital Input connected to terminal D8 and DC. This chapter also describes User Scaling of the standard IO. The controller is calibrated for life against known reference standards during manufacture, but user scaling allows you to offset the ‘permanent’ factory calibration to either:- Note:- Names shown in italics can be customised. Table 17-1: Standard I/O 17-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Standard IO 17.2. PV INPUT Allows access to parameters which set up the fixed Process Variable Input connected to terminals VH, VI, V+ and V-. This is the PV input for a single loop controller. 17.2.1. To Scale the PV Input Scaling of the PV input applies to linear process inputs only, eg linearised transducers, where it is necessary to match the displayed reading to the electrical input levels from the transducer. PV input scaling is not provided for direct thermocouple or RTD inputs. Figure 17-1 shows an example of input scaling. where an electrical input of 4-20mA requires the display to read 2.5 to 200.0 units. Display Reading Display Hi eg 200.0 Display Lo eg 2.5 Electrical Input Electrical Lo eg 4 mA Electrical Hi eg 20 mA Figure 17-1: Input Scaling (Standard IO) 17.2.2. Offset Offset has the effect of moving the whole curve, shown in Figure 17-1,up or down about a central point. The ‘Offset’ parameter is found in the STANDARD IO (PV Input) page as shown in the controller view in Section 17.2.3. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 17-3
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2704 Controller Contents MODEL 2704
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