6 - module status and input data, Chapter objectives, Reading data from the rtd module – Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE User Manual
Page 31: 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 read block transfer for this module moves up to 8
words from the RTD module in one program scan. The words contain module
status and input data from each channel. When a block transfer length of 0 is
programmed, the 1771–IR/B will respond with the Series A default of 8
words.
The user program initiates the request to transfer data from the RTD module to
the processor.
Table 6.A
BTR Word Assignments for RTD Input Module (1771-IR/B)
Decimal Bit
15
14
13 12 11 10
9
8
7
6
5
4
3
2
1
0
Octal Bit
17
16
15 14 13 12 11 10
07
06
05 04 03 02 01 00
1
0
RTS
Timeout
Channel Overrange
EEPROM
calibration
values not
readable
Power-
up
Channel Underrange
2
Not used
Channel Polarity
Not used
Channel Overflow
3
Channel 1 Data
4
Channel 2 Data
5
Channel 3 Data
6
Channel 4 Data
7
Channel 5 Data
8
Channel 6 Data
9
Auto-calibration Status Word
Chapter Objectives
Reading Data from the RTD
Module