2–11
How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
8 Input Analog Module (Cat. No. 1794IE8) Image Table Mapping
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
Not used
Not used
Not used
Not used
Not used
Input Size
Output Size
0 or 1 Word
1 to 9 Words
PU
Memory Map of Analog Input Module Image Table – 1794-IE8
Dec. Bit 15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Size
Oct. Bit 17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Size
S
Analog Value Channel 0
Read Word 1
S
Analog Value Channel 1
Read Word 2
S
Analog Value Channel 2
Read Word 3
S
Analog Value Channel 3
Read Word 4
S
Analog Value Channel 4
Read Word 5
S
Analog Value Channel 5
Read Word 6
S
Analog Value Channel 6
Read Word 7
S
Analog Value Channel 7
Read Word 8
PU
Not used - set to zero
U7
U6
U5
U4
U3
U2
U1
U0
Read Word 9
C7
C6
C5
C4
C3
C2
C1
C0
F7
F6
F5
F4
F3
F2
F1
F0
Write Word 1
Not used - set to 0
Write Word 2 thru 6
Where:
PU = Power up bit - included in series B modules only.
U = Underrange bits for 420mA inputs
C = Configure select bit
F = Full range bit
S = sign bit (in 2's complement)