6 - module status and input data, Chapter objectives, Reading data from the module – Rockwell Automation 1771-IXHR , D17716.5.80 HIGH RESOL.THERMOCOUPLE User Manual
Page 32: Module status and input data
Chapter
6
6Ć1
Module Status and Input Data
In this chapter you will read about:
reading data from your module
input module read block format
Block transfer read programming moves status and data from the input module
to the processor’s data table in one I/O scan (Table 6.A). The processor user
program initiates the request to transfer data from the input module to the
processor.
During normal operation the module transfers up to 12 words to the processor’s
data table file. The words contain module status and input data from each
channel. During normal operation, when a block transfer length of zero (0)
is programmed, the 1771–IXHR will respond with a default length of 12.
Table 6.A
BTR Word Assignments for the 1771-IXHR Input Module
Decimal Bit
15
14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1
Not used
Status Codes
2
Inputs overrange
Inputs underrange
3
Inputs > high alarm
Inputs < low alarms
4
Channel 1 input
5
Channel 2 input
6
Channel 3 input
:
:
11
Channel 8 input
12
Cold Junction Temperature in
o
C or
o
F
1
13
Inhibits
Auto-calibration request
1
= Cold junction temperature is provided in 0.1
o
C or 0.1
o
F resolution. The filter time constant (Tau) for
this value is fixed at 6.4 seconds.
Chapter Objectives
Reading Data from the Module