4–3
Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter
Publication 17946.5.2 - May 1996
The following read and write words and bit/word descriptions
describe the information written to and read from the analog
modules. Each word is composed of 16 bits.
8 Input Analog Module (Cat. No. 1794IE8 Series B)
Module Image
I/O Image
Input Data Channel 0
Input Data Channel 1
Input Data Channel 2
Input Data Channel 3
Input Data Channel 4
Input Data Channel 5
Input Data Channel 6
Input Data Channel 7
Underrange
Configure select
Input Size
Output Size
0 or 1 Word
1 to 9 Words
PU
Analog Input Module (1794-IE8) Read
Word/Dec. Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Word/Octal Bit
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Read Word 0
S
Analog Value Channel 0
Word 1
S
Analog Value Channel 1
Word 2
S
Analog Value Channel 2
Word 3
S
Analog Value Channel 3
Word 4
S
Analog Value Channel 4
Word 5
S
Analog Value Channel 5
Word 6
S
Analog Value Channel 6
Word 7
S
Analog Value Channel 7
Word 8
PU
Not used - set to zero
U7
U6
U5
U4
U3
U2
U1
U0
Where:
S = sign bit (in 2's complement)
U = Underrange bits for 420mA inputs
PU = Power up bit
Mapping Data for the
Analog Modules