Rockwell Automation 1769-IF16V Compact High Density Analog Input Modules - Manual (Page 39)

Publication 1769-UM018A-EN-P - October 2008 39
Module Data, Status, and Channel Configuration Chapter 3
Enable/Disable Channel (EC)
This configuration selection lets each channel be enabled individually.
Input Filter Selection
The input filter selection field lets you select the filter frequency for
each channel. The filter frequency affects the noise rejection
characteristics, channel step response, and module update time, as
explained below.
Noise Rejection
The modules use a digital filter that provides noise rejection for the
input signals. The filter is programmable, allowing you to select from
five filter frequencies for each channel. A lower frequency (60 Hz
versus 315 Hz) can provide better noise rejection but it increases
channel update time.
Normal Mode Rejection is better than 50 dB at 50 and 60 Hz, with the
50 and 60 Hz filters selected, respectively. Transducer power supply
noise, transducer circuit noise, or process variable irregularities may
also be sources of normal mode noise.
1769-IF16V Module: Bit Definitions for Input Range and Input Data Configuration Words
Define To Choose Make these bit settings
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Input
Range
Select -10…+10V 0 0 0 0
0…5V 0 0 0 1
0…10V 0 0 1 0
1…5V 0 0 1 1
Input
Data
Format
Select Proportional Counts 0 0 0
Engineering Units 0 0 1
Scaled for PID 0 1 0
Percent Range 0 1 1
TIP
When a channel is not enabled (0), no voltage or
current reading is provided to the controller by the
A/D converter.