Publication 1794-6.5.8 - January 2010
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 73
Word 6 Bits 00-01 Underrange bits (U). – These bits are set (1) when the input channel is below a preset
limit as defined by the configuration selected. U0 (bit 00) corresponds to input channel 0
and U1 (bit 01) corresponds to input channel 1, etc. Refer to Table 4.15.
Bits 02-03 Wire-Off status bits. (W). – These bits, when set (1), indicate the corresponding
current output channel is open. W0 (bit 02) corresponds to channel 0, and W1 (bit 03)
corresponds to channel 1.
Bits 04-05 Overrange bits (V). – These bits are set (1) when the input channel is above a preset
limit as defined by the configuration selected. Bit 04 corresponds to input channel 0 and
bit 05 corresponds to input channel 1. Refer to Table 4.15.
Bits 06-09
(06-11)
Not used. Set to 0.
Bits 10-11
(12-13)
Hold output bits (P). – These bits are set (1) in response to Q0 or Q1 and transition of
the EN bit. When P0 or P1 is set (1), they indicate that the output is holding at the level
in the readback data for the respective channel. These bits return to 0 when the output
data matches the readback output data.
Bits 12-15
(14-17)
Not used. Set to 0.
Table 4.17
Word/Bit Descriptions for the 1794-IF2XOF2I Isolated Analog Combo Module Read
Write Word Decimal Bit
(Octal Bit)
Definition
Table 4.18
Analog Combo Module (1794-IF2XOF2I) Read
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 EN S1 S0 0 0 0 0000000000
Word 1 Output Data Channel 0
Word 2 Output Data Channel 1
Word 3 00000000Input Channel 1 Filter Input Channel 0 Filter
Word 4 Output Channel 1
Configuration
Output Channel 0
Configuration
Input Channel 1
Configuration
Input Channel 0
Configuration
Word 5 0 Real Time Sample Programed Interval
Word 6 IC 1 TR IT Q1 Q2 0 0 RV QK CK GO Input Channel 0
Configuration
Where:
EN = Enable outputs; 0 = output follows S1/S0, 1 = output enabled
IC = Initiate configuration bit
IT = Interrupt Toggle bit
TR = Transparent bit
Q0 and Q1 = Request for outputs to hold
RV = Revert to defaults bit
QK = Quick calibration
CK = Calibration clock
GO = Gain offset select
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