5 - module status and input data, Chapter objectives, Reading data from your module – Rockwell Automation 1771-IFE ANALOG INPUT MODULE User Manual
Page 43: Module status and input data, Chapter, Chapter objectives reading data from your module
Chapter
5
Publication 1771Ć6.5.115 - February 1999
Module Status and Input Data
In this chapter, we describe:
•
reading data from your module
•
block transfer 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
(Figure 5.1). The processor’s user program initiates the request to
transfer data from the input module to the processor.
Figure 5.1
WordAssignments for Analog Input Module (1771ĆIFE/C) Block Transfer Read
Dec. Bits
15 14 13 12 11 10 09 08 07 06 05 04
03
02
01
00
Description
Octal Bits
17 16 15 14 13 12 11 10 07 06 05 04
03
02
01
00
Description
Word 1
HF EE CS RTS IS OR PU
Diagnostics
2
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
Data underrange for channels 1-16
1
3
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
Data overrange for channels 1-16
1
4
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
Data polarity for channels 1-16
5
Channel 1 Input
Channel 1 Input
6
Channel 2 Input
Channel 2 Input
7
Channel 3 Input
Channel 3 Input
8
Channel 4 Input
Channel 4 Input
⇓
⇓
⇓
⇓
20
Channel 16 Input
Channel 16 Input
21
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
Offset Calibration Results
22
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
Gain Calibration Results
Where:
PU= Power up bit
OR = Out of range bit
IS = Invalid scaling bit
RTS = Real time sampling bit
HF = Hardware Fault
EE = EEPROM status bits
CS = Calibration status bits
1
These bits are set (1) at approximately the input range limits selected (Table 5.B).
During normal operation, the processor transfers up to 20 words (22
during calibration) to the module when you program a BTR
instruction to the module’s address.
When a BTR length of 0 is programmed, the 1771-IFE/C will
respond with the series A module default length of 20.
Chapter Objectives
Reading Data From Your
Module