An analog output in pressure transmitters from series 30 can be programmed via interface. Once the paths SIGNAL SENSORS -> TRANSFORMATION AND DIGITAL VALUE -> ANALOG SIGNAL are calibrated regardless of their manufacturer, an output analog can be configured for different pressures and pressure units without recalibration. To configure the scale of an analog output, follow these steps:

•The Reading the Configuration of a Device Tag allows determining whether a device contains an analog output. The coefficients needed for that calculation can be read from the Reading or Writing Coefficients Tag. A new scale can be define by writing to that same Tag

•For devices with CLASS.GROUP equal to 5.1, the new scale must be defined in the Configuring Zero Point Tag

•For devices with CLASS.GROUP equal to 5.20, the analog output is updated automatically

Reading a Range of Pressure Values for an Analog Output

K[n] coefficients must be read using the Reading or Writing Coefficients Tag to allow the calculation of upper and lower limits of an analog output using the next formulas:

•A = (K[92] - K[68]) ÷ K[69]

•B = (K[93] - K[68]) ÷ K[69]

Configuring a New Range of Pressure Values for an Analog Output

K[68] and K[69] coefficients must be calculated and written to a device using the Reading or Writing Coefficients Tag using the next formulas:

•A = K[92] - ((K[93] - K[92]) ÷ (B - A)) × A

•B = (K[93] - K[92]) ÷ (B - A)

In which:

•K[x] is a coefficient with the corresponding number x. For more information please check the Reading or Writing Coefficients Tag

•A is for the pressure, in bar, in which the signal K[94] must be written

•B is for the pressure, in bar, in which the signal K[95] must be written

Other pressure units must be converted to bar.