Characteristics Of A/D Conversion; Figure 5 - Characteristics Of A/D Conversion (Voltage Input) - Honeywell 2MLF-AV8A User Manual

Characteristics of A/D conversion

Voltage input
A/D conversion module is used for converting analog electric signal input from the
external device to digital value. Analog input signal converted to digital value can be
processed by the PLC's CPU. If analog input range of -10 ~ 10V is used in voltage type
of A/D conversion module, -10V of analog input corresponds to output of digital value 0.
Analog input of +10V corresponds to output digital value of 16000. This means, an
analog input of 1.25mV represents digital value of 1, as shown in Figure 5.
Figure 5 – Characteristics of A/D conversion (voltage input)
Current input
If analog input range of 0 ~ 20mA is used in current type of A/D conversion module, the
0mA of analog input corresponds to the output of digital value of 0. Analog input of
20mA corresponds to the output digital value of 16000. This means analog input of
1.25µA represents digital value of 1 (Figure 6).
R200 Analog Input Module 2MLF-AV8A, AC8A User's Guide
September 2010 Honeywell
1. Introduction
1.3. Terminology
19