Multi-Tech Systems 7600, 7500 manual Configuring Analog Input, Analog Input Module

Configuring Analog Input ION 7500 / ION 7600 User’s Guide

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):

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

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:

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 kΩ	12 V
0 to 10 V	>= 50 kΩ	25 V

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.

Page 224 Digital and Analog I/O Technical Note