Rockwell Automation 1794-XXXX FLEX I/O High-Density Analog Modules User Manual
Page 60
Publication 1794-UM062A-EN-P - September 2012
52
Data Tables
Range Selection Bits – 1794-OE4/B and 1794-OE4XT Analog Output Module
Channel No.
Ch 00
Ch 01
Ch 02
Ch 03
F0
C0
F1
C1
F2
C2
F3
C3
00
08
(10)
01
09
(11)
02
10
(12)
03
11
(13)
4…20 mA
0
1
0
1
0
1
0
1
0…10V DC
/0…20 mA
1
0
1
0
1
0
1
0
-10…+10V DC
1
1
1
1
1
1
1
1
Off
(1)
0
0
0
0
0
0
0
0
Where:
C = Configure select bit
F = Full range bit
(1)
When configured to OFF, individual channels will return 0V or 0 mA on Series B modules, and 2V or 4 mA on
Series A modules.
Word/Bit Descriptions – 1794-OE4/B and 1794-OE4XT Analog Output Module
Word
Decimal Bit
(Octal Bit)
Definition
Read word 0
Bits 00…03
Current outputs only – When set (1), the wire on the
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 04…14
(04…16)
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.
Write Word 0
Bits 00…14
(00…16)
Channel 0 analog data – 12-bit left justified two's
complement number; unused lower bits are zero; 4…20
mA uses all 16 bits.
Bit 15 (17)
Channel 0 analog data sign bit.
Write Word 1
Bits 00…14
(00…16)
Channel 1 analog data – 12-bit left justified two's
complement number; unused lower bits are zero; 4…20
mA uses all 16 bits.
Bit 15 (17)
Channel 1 analog data sign bit.
Write Word 2
Bits 00…14
(00…16)
Channel 2 analog data – 12-bit left justified two's
complement number; unused lower bits are zero; 4…20
mA uses all 16 bits.
Bit 15 (17)
Channel 2 analog data sign bit.
Write Word 3
Bits 00…14
(00…16)
Channel 3 analog data – 12-bit left justified two's
complement number; unused lower bits are zero; 4…20
mA uses all 16 bits.
Bit 15 (17)
Channel 3 analog data sign bit.