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model 2704 controller installation and operation handbook - Soliton

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<strong>2704</strong> Controller Module IO<br />

18.4. MODULE SCALING<br />

The IO modules are scaled as already described in Chapter 17 for the fixed inputs <strong>and</strong><br />

outputs. The procedures are repeated below:-<br />

18.4.1. The PV Input<br />

Scaling of the PV input applies to linear process inputs, eg linearised transducers, where it is<br />

necessary to match the displayed reading to the electrical input levels from the transducer.<br />

PV input scaling is not provided for direct thermocouple or RTD inputs.<br />

Figure 18-1 shows an example of input scaling. where an electrical input of 4-20mA requires<br />

the display to read 2.5 to 200.0 units.<br />

Display<br />

Reading<br />

Engineering<br />

value<br />

eg 200.0<br />

Engineering<br />

value<br />

eg 2.5<br />

Electrical Input<br />

Electrical Lo<br />

eg 4 mA<br />

Electrical Hi<br />

eg 20 mA<br />

Figure 18-1: Input Scaling (Modules)<br />

Installation <strong>and</strong> Operation H<strong>and</strong>book. Part No HA026502 Issue 1.0 Apr-00 18-15

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