Rockwell Automation 1794-IE4XOE2,1794-IE8,1794-OE4,D17946.5.2 FLEX I/O ANALOG MODULE User Manual
Page 48
5–4
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Publication 1794Ć6.5.2 - May 1996
Size
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Decimal Bit
Read Words
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Octal 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 4Ć20mA 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
Ć10 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 on Series B modules, and 4Ć20mA 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 - 12Ćbit left justified two's complement
number; unused lower bits are zero; 4Ć20mA 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 - 12Ćbit left justified two's complement
number; unused lower bits are zero; 4Ć20mA 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 - 12Ćbit left justified two's complement
number; unused lower bits are zero; 4Ć20mA 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 - 12Ćbit left justified two's complement
number; unused lower bits are zero; 4Ć20mA uses all 16 bits.
Read Word 4
Bits 15
Channel 3 analog data sign bit.