2–12
How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
Range Selection Bits for the 1794-IE8 Analog Input Module
Channel No.
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
F0
C0
F1
C1
F2
C2
F3
C3
F4
C4
F5
C5
F6
C6
F7
C7
Decimal Bit
00
08
01
09
02
10
03
11
04
12
05
13
06
14
07
15
0-10V dc/0-20mA
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
4-20mA
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
10 to +10V dc
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Off
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
C = Configure select bit
F = Full range bit
1
When configured to off, individual channels will return 0000H.
Word/Bit Descriptions for the 1794-IE8 Analog Input Module
Write
Word
Decimal Bit
Definition
Read Word 1
Bits 00-14
Channel 0 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 1
Bits 15
Channel 0 analog data sign bit.
Read Word 2
Bits 00-14
Channel 1 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 2
Bits 15
Channel 1 analog data sign bit.
Read Word 3
Bits 00-14
Channel 2 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 3
Bits 15
Channel 2 analog data sign bit.
Read Word 4
Bits 00-14
Channel 3 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 4
Bits 15
Channel 3 analog data sign bit.
Read Word 5
Bits 00-14
Channel 4 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 5
Bits 15
Channel 4 analog data sign bit.
Read Word 6
Bits 00-14
Channel 5 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 6
Bits 15
Channel 5 analog data sign bit.
Read Word 7
Bits 00-14
Channel 6 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 7
Bits 15
Channel 6 analog data sign bit.
Read Word 8
Bits 00-14
Channel 7 analog data
- 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read Word 8
Bits 15
Channel 7 analog data sign bit.