Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual User Manual
Page 41
2–21
How Communication Takes Place and I/O Image Table Mapping
Publication 1794ĆUM057B-EN-P - November 2001
1794ĆIE4XOE2 Range Selection Bits
Channel No.
Input
Channel 0
Input
Channel 1
Input
Channel 2
Input
Channel 3
Output
Channel 0
Output
Channel 1
F0
C0
F1
C1
F2
C2
F3
C3
F4
C4
F5
C5
Decimal Bits
(Octal Bits)
00
08
(10)
01
09
(11)
02
10
(12)
03
11
(13)
04
12
(14)
05
13
(15)
4-20mA
0
1
0
1
0
1
0
1
0
1
0
1
0-10V dc/0-20mA
1
0
1
0
1
0
1
0
1
0
1
0
Ć10 to +10V dc
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
C = Configure select bit
F = Full range bit
1
When configured to off, individual channels will return or send either 0V or 0mA on Series B modules. On Series modules, 2V or 4mA is output
until the module is configured.
1794ĆIE4XOE2 Word/Bit Descriptions
Word
Decimal Bit
(Octal Bit)
Definition
Read Word 1
Bits 00-14
(00-16)
Channel 0 analog data - 12Ćbit left justified two's complement number; unused
lower bits are zero; 4Ć20mA uses all 16 bits.
Bits 15 (17)
Channel 0 analog data sign bit.
Word 2
Bits 00-14
(00-16)
Channel 1 analog data - 12Ćbit left justified two's complement number; unused
lower bits are zero; 4Ć20mA uses all 16 bits.
Bits 15 (17)
Channel 1 analog data sign bit.
Word 3
Bits 00-14
(00-16)
Channel 2 analog data - 12Ćbit left justified two's complement number; unused
lower bits are zero; 4Ć20mA uses all 16 bits.
Bits 15 (17)
Channel 2 analog data sign bit.
Word 4
Bits 00-14
(00-16)
Channel 3 analog data - 12Ćbit left justified two's complement number; unused
lower bits are zero; 4Ć20mA uses all 16 bits.
Bits 15 (17)
Channel 3 analog data sign bit.
Bits 00-03
Underrange bits (U) for individual channels (4Ć20mA current inputs 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 is at or
below 4mA.
Word 5
Bits 04Ć05
Wire Off bits (W) - Current outputs only - When set (1), the wire on the current
output is broken or the load resistance is too high. Bit 00 corresponds to channel 0,
bit 01 corresponds to channel 2, and so on.
Bits 06-14
(06-16)
Not used
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 3) are 0 (unconfigured state). The configuration register can be cleared by
either a reset, or by the user writing all zeroes to it.