4–4
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Publication 17946.5.2 - May 1996
Word/Bit Descriptions for the 1794-IE8 Analog Input Module
Read
Word
Decimal Bit
(Octal Bit)
Definition
Read Word 0
Bits 00-14
(00-16)
Channel 0 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Read Word 0
Bits 15 (17)
Channel 0 analog data sign bit.
Word 1
Bits 00-14
(00-16)
Channel 1 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 1
Bits 15 (17)
Channel 1 analog data sign bit.
Word 2
Bits 00-14
(00-16)
Channel 2 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 2
Bits 15 (17)
Channel 2 analog data sign bit.
Word 3
Bits 00-14
(00-16)
Channel 3 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 3
Bits 15 (17)
Channel 3 analog data sign bit.
Word 4
Bits 00-14
(00-16)
Channel 4 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 4
Bits 15 (17)
Channel 4 analog data sign bit.
Word 5
Bits 00-14
(00-16)
Channel 5 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 5
Bits 15 (17)
Channel 5 analog data sign bit.
Word 6
Bits 00-14
(00-16)
Channel 6 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 6
Bits 15 (17)
Channel 6 analog data sign bit.
Word 7
Bits 00-14
(00-16)
Channel 7 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 7
Bits 15 (17)
Channel 7 analog data sign bit.
Bits 00-07
Underrange bits (U)
for individual channels
(420mA current input only)
-
Bit 00 corresponds to input channel 0, bit 01 corresponds to input channel 1,
and so on. When set (1), indicates either a broken or open input wire, or input
current at or below 4mA.
Word 8
Bits 0814
(1016)
Not used - set to 0.
Bit 15 (17)
Power Up bit - included in series B modules only. This bit is always 0 in
series A modules. This bit is set to 1 when all bits in the configuration
register (write word 0) are 0 (unconfigured state).
The configuration
register can be cleared by either a reset, or by the user writing all zeroes to it.
Analog Input Module (1794-IE8/B) Write Configuration Block
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
Write Word 0
C7
C6
C5
C4
C3
C2
C1
C0
F7
F6
F5
F4
F3
F2
F1
F0
Where:
C = Configure select bit
F = Full range bit