Owner's manual

3-8 MicroLogix™ 1200 IO Universal Input Module
User'sManualPub.0300243‐02Rev.B
Section 3.5
Read Input
Data
Input data is read for each channel, converted to a scaled digital value, and stored in the
input file. Use the addressing scheme below to locate the 8 input words used for
channels 0 through 7, respectively.
(1) I/O located on the controller (embedded I/O) is slot 0. I/O added to the controller (expansion I/O) begins
with slot 1.
The layout for the input file is shown below.
Table 3-4 (Input Data)
Word Description
I:e.0 Analog Data Channel 0
I:e.1 Analog Data Channel 1 ( 0 if Ch 0 RTD/Resistance)
I:e.2 Analog Data Channel 2
I:e.3 Analog Data Channel 3 ( 0 if Ch 2 RTD/Resistance)
I:e.4 Analog Data Channel 4
I:e.5 Analog Data Channel 5 ( 0 if Ch 4 RTD/Resistance)
I:e.6 Analog Data Channel 6
I:e.7 Analog Data Channel 7 ( 0 if Ch 6 RTD/Resistance)
!
Attention
Status data is not available for the 1762sc-IF8u module.
Section 3.6
Module
Update Time
The module update time is determined by the number of channels enabled and by the
filter frequency selected for each channel.
ADC Filter
Frequency
Filter Frequency
(-3dB point)
Conversion Time Module update
470 Hz 109 Hz 20 ms = sum of conversion
times for each
enabled channels
62 Hz 14 Hz 45 ms
17 Hz 4 Hz 135 ms
4Hz 1 Hz 495 ms