Emerson DE, VH, VE, DH manual Main Menu AG-Analog/Digital Inputs

Advanced Microprocessor with Graphics Control Setup

Six different data types are recorded for graphing: temperature, humidity, and four user defined ana- log inputs. Each data type can be viewed over three different time scales and two different resolu- tions. The three time scales are 90 minutes, 8 hours, and 24 hours. The two resolutions are minimum and maximum. With minimum resolution selected, the full scale of the sensor is displayed. In other words, the largest and smallest possible sensor readings are shown. Maximum resolution shows a range which covers two fifths of the full scale sensor range.

4.10.1Modify Plot Scales

The Modify Plot Scales menu item adjusts the layout of the graph. This setup screen selects the time scale and resolution. It also adjusts the center of the graph for a maximum resolution graph.

The time scale and resolution can also be changed while the graph is displayed. The DOWN arrow key changes the time scale from 90 minutes to 8 hours to 24 hours. The UP arrow key toggles the display between maximum and minimum resolution.

4.11Main Menu (AG)—Analog/Digital Inputs

Selecting Analog/Digital Inputs steps to the following menu:

•READ ANALOG INPUTS

•SETUP ANALOG INPUTS

•READ DIGITAL INPUTS

•SETUP DIGITAL INPUTS

4.11.1Read Analog Inputs

The four (4) analog sensor inputs can be monitored from the display. The inputs are filtered, then dis- played along with the text label assigned during setup.

4.11.2Setup Analog Inputs

For installation of analog sensors, see 4.11 - Main Menu (AG)—Analog/Digital Inputs.

After selecting a compatible sensor and properly wiring it to the terminals, setting up the control to monitor the sensor is as follows:

Slope

The slope is a multiplier used to scale the input signal. The slope can be positive (rising) or negative (falling) and can range from 0 (resulting in a horizontal line) to ±999. The slope for a 0-5 V input is per 1 V input, for 0-10 V input is per 2 V input, and for 4-20 mA is per 4 mA input. For example, assuming an intercept of 0 for a 0-10 V sensor input with a slope of 50, an input of 1 V would be displayed as 25: (1x[50/2]); 2 V would be 50: (2x[50/2]); 3 V would be 75: (3x[50/2]), etc.

Intercept

The intercept is an offset from point 0 corresponding to 0 volts or 0 mA input. The intercept can be positive or negative and can be a point from 0 to ±999. Adding an intercept of 100 to the slope example above, 1 V would be 125: 100 + (1x[50/2]); 2 V would be 150: 100 + (2x[50/2]); 3 V would be 175: 100 + (3x[50/2]); etc.

NOTE

For a 4-20 mA input sensor, if the desired reading at 4 mA input is 0, then an intercept of -1 x slope would be required. For example, assuming a slope of 50, the formula would be ([-1 x 50] + 4 x [50/4]) = 0. The intercept is -50.

Text

You may enter a custom label for each analog input. The text label can be 20 characters in length including any of the following:

ABCDEFGHIJKLMNOPQRSTUVWXYZ#%*-0123456789, or space.

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