4–10
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Publication 17946.5.2 - May 1996
Definition
Decimal Bit
(Octal Bit)
Word
Word 3
Bits 00-14
(00-16)
Channel 3 analog data
- 12bit left justified two's complement number;
unused lower bits are zero; 420mA uses all 16 bits.
Word 3
Bits 15 (17)
Channel 3 analog data sign bit.
Bits 00-03
Underrange bits (U)
for individual channels
(420mA 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 4
Bits 0405
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.
Word 4
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.
Analog Combo Module (1794-IE4XOE2/B) 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
Write Word 0
S
Analog Data - Output Channel 0
Word 1
S
Analog Data - Output Channel 1
Word 2
0
Not used - set to 0
M1
M0
Word 3
Not used
C5
C4
C3
C2
C1
C0
0
0
F5
F4
F3
F2
F1
F0
Words 4 and 5
Not used - set to 0
Word 6
S
Safe State Value - Output Channel 0
Word 7
S
Safe State Value - Output Channel 1
Where:
M = Multiplex control bits
S = Sign bit (in 2's complement)
C = Configure select bit
F = Full range bit