Allen-Bradley 1794-IE8 Series B User Manual

5–4 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Publication 17946.5.2 - May 1996
Size00010203040506070809101112131415Decimal Bit
Read Words00010203040506071011121314151617Octal Bit
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
Where: PU = Power up bit - included in series B modules only .
U = Underrange bits for 420mA inputs
S = sign bit (in 2' s complement)
Analog Input Module (1794-IE8/B) Write
Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Size
Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Write Words
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: C = Configure select bit
F = Full range bit
Range Selection Bits for the 1794-IE8/B 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 of f, individual channels will return 0000H on Series B modules, and 420mA on Series A modules.
Word/Bit Descriptions for the 1794-IE8/B Analog Input Module
Word Decimal Bit Definition
Read Word 1
Bits 00-14
Channel 0 analog data - 12bit left justified two's complement
number; unused lower bits are zero; 420mA 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 - 12bit left justified two's complement
number; unused lower bits are zero; 420mA 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 - 12bit left justified two's complement
number; unused lower bits are zero; 420mA 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 - 12bit left justified two's complement
number; unused lower bits are zero; 420mA uses all 16 bits.
Read
Word
4
Bits 15 Channel 3 analog data sign bit.

Allen-Bradley 1794-IE8 Series B Specifications

General

Brand	Allen-Bradley
Model	1794-IE8 Series B
Category	Control Unit
Language	English