Rockwell Automation 1790D-NOV2/TNOV2 CompactBlock LDX Analog Modules User Manual
Page 37
Publication 1790-UM001A-EN-P - March 2002
Module Data, Status, and Channel Configuration for Analog Input Modules 3-3
Analog Input Data File With Discrete Input Expansion Modules
The data table below shows the structure for an analog base module
with one (1) of the following 8-input modules:
•
1790-8BV8BX/-T8BV8BX
•
1790-T8A0X discrete expansion module.
1790D-N4C0/-TN4C0, 1790D-N4V0/-TN4V0 Input Data File with 8-Bit
Discrete Expansion Module
Word/Bit Descriptions
Word
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Not Used
Analog Input Data Channel 0
1
Not Used
Analog Input Data Channel 1
2
Not Used
Analog Input Data Channel 2
3
Not Used
Analog Input Data Channel 3
4
Not Used
S3
S2
S1
S0
5
Not Used
D7
D6
D5
D4
D3
D2
D1
D0
Word
Decimal Bit
Description
Read Word 0
Bits 00-11
Channel 0 input data
Bits 12-15
Not used: Set to 0
Read Word 1
Bits 00-11
Channel 1 input data
Bits 12-15
Not used: Set to 0
Read Word 2
Bits 00-11
Channel 2 input data
Bits 12-15
Not used: Set to 0
Read Word 3
Bits 00-11
Channel 3 input data
Bits 12-15
Not used: Set to 0
Read Word 4
Bits 00-03
Status bits for individual channels - Bit 00 corresponds to input
channel 0, bit 01 corresponds to input channel 1 and so on.
When set (1) indicates:
•
No field power
•
Open wire (4-20mA current input only)
•
Under range (4-20mA current input only)
•
Recoverable module fault (whole channel to be set)
•
Unrecoverable module fault (whole channel to be set)
Bits 04-15
Not used: Set to 0
Read Word 5
Bits 00-07
Discrete Input expansion data
Bits 08-15
Not Used