Rockwell Automation 1793-OE2S FLEX INTEGRA ANALOG MOD User Manual
Page 43
Publication 1793-6.5.1 - April 1999
5-4
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Analog Input Module (1793-IE4 and -IE4S) Read
Word/Bit Descriptions for the 1793-IE4 and -IE4S Analog Input Module Read
Analog Input Module (1793-IE4 and -IE4S) 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
Read Word 1
S
Analog Value Channel 0
Word 2
S
Analog Value Channel 1
Word 3
S
Analog Value Channel 2
Word 4
S
Analog Value Channel 3
Word 5
S
Reserved
Word 6
S
Reserved
Word 7
S
Reserved
Word 8
S
Reserved
Word 9
PU
Not used – set to zero
U3
U2
U1
U0
Where: S = sign bit (in 2’s complement)
U = Underrange bits for 4-20mA inputs
PU = Power up bit
Word
Decimal Bit
(Octal Bit)
Definition
Read Word 1
Bits 00-14
(00-16)
Channel 0 analog data – 12-bit left justified two’s complement number;
unused lower bits are zero; 4-20mA uses all 16 bits.
Bits 15 (17)
Channel 0 analog data sign bit.
Word 2
Bits 00-14
(00-16)
Channel 1 analog data – 12-bit left justified two’s complement number;
unused lower bits are zero; 4-20mA uses all 16 bits.
Bits 15 (17)
Channel 1 analog data sign bit.
Word 3
Bits 00-14
(00-16)
Channel 2 analog data – 12-bit left justified two’s complement number;
unused lower bits are zero; 4-20mA uses all 16 bits.
Bits 15 (17)
Channel 2 analog data sign bit.
Word 4
Bits 00-14
(00-16)
Channel 3 analog data – 12-bit left justified two’s complement number;
unused lower bits are zero; 4-20mA uses all 16 bits.
Bits 15 (17)
Channel 3 analog data sign bit.
Words 5-8
Reserved
Word 9
Bits 00-03
Underrange bits (U) for individual channels (4-20mA 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.
Bits 04-14
(04-16)
Not used – set to 0.
Bit 15 (17)
Power Up bit .- 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.
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 1
Reserved
C3
C2
C1
C0
Reserved
F3
F2
F1
F0
2
Reserved
3
Reserved
4
Reserved
5
Reserved
6
Reserved
Where: C = Configure select bit
F = Full range bit