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Configuring Analog Input ION 7500 / ION 7600 User’s Guide
Page 224 Digital and Analog I/O Technical Note
Configuring Analog Input
Analog inputs can measure and store analog information such as electrical signals
from transducers; transducers derive the electrical signals from flow rates,
temperatures, pressures, rotations, and fluid levels. Analog inputs require the
installation of an optional circuit board inside the meter.
Analog Input Module
The Analog Input module takes an analog signal from a hardware port, scales it,
and makes the scaled result available in its output register.
ION meters with analog input connections have two types of analog input ports
available when you order a meter (refer to your meter’s label to determine what
type you ordered):
The accuracy of these analog inputs is ±0.3% of full-scale.
Connecting Auxiliary Analog Inputs (ION 7700 Meters)
The optional internal analog input boards for ION 7700 meters provide four
double-ended current or voltage inputs for direct interface with transducers or
thermocouples. The option ordered determines the configuration and maximum
input range for all four analog input pairs (refer to the label on the ION 7700 for
the AUX rating). All four must have the same input rating (e.g. 0 - 20 mA). Analog
inputs receive DC signals only. Options include:
Analog Input Module Setup Registers
An ION Analog Input software module corresponds to each hardware input port.
This module takes signals from an input port, scales it, and makes the result
available to the meter. The register settings let you determine the value that
appears in the output register when the lowest and highest possible values from
the hardware are applied, and determine the hardware port that the module will
control.
To learn more about the Analog Input module scaling, refer to the section “Setting
Analog Zero and Full Scale Values” on page 227.
Analog Input Option Input Impedance Max Common Mode Voltage
0 to 1 mA
475
Ω
8 V
0 to 20 mA (scalable to 4 - 20 mA)
25
Ω
20 V
ION 7700 Analog Input Option Input Impedance Max Common Mode Voltage
0 to 1 mA
49.9
Ω
8 V
0 to 20 mA
100
Ω
20 V
0 to 1 V
>= 50 k
Ω
12 V
0 to 10 V
>= 50 k
Ω
25 V