Rockwell Automation AB quality Allen-Bradley 1746-INT4 User Manual page 90

90 Channel Configuration Worksheets
Channel Configuration Word (O:e.0 through O:e.3) — Bit Descriptions (Continued)
Bit or Define To Select
Bits
6, 7 Open- Zero
circuit
Upscale
Mode
Downscale
Invalid
8 Units Degrees C
°F, °C
Degrees F
9, 10 Unused Unused
11 Chnl Channel Off
Enable
Channel On
12...15 Unused Unused
Enter Your Bit Selections >>
Publication 1746-UM614B-EN-P - September 2007
Set these bits in the Channel Configuration Word
15...12 11 10 9 8 7 6 5 4 3 2 1 0
0 0
0 1
1 0
1 1
0
1
0 0
0
1
0000
0000
Description
Select module response to a
detected open-circuit from: Zero
to force the channel data word to
zero. Upscale to force the channel
data word to full scale. Downscale
to force channel data word to low
scale. Important: A bit selection or
1 1 is invalid. For an open CJC
thermistor, mV channels are not
affected. Important: The module
requires 500 ms or one module
update to flag the error while it
ramps the channel input.
Select °C/°F for thermal inputs.
Ignored for mV inputs. Important: For
EU x1 and °F (0.1 °F), an over-range
error will occur above 3276.7 °F
(cannot exceed 32,767 counts).
These bits must be zero for a
valid configuration.
Disable unused channels for
faster response. When set, the
module configures the channel and
reads the channel input before
setting bit 11 in the status word. If
you change the configuration word,
the status word must reflect the
change before new data is valid. If
you clear the configuration word, the
module clears channel and status
words. For a new configuration word,
channel data and status words
remain cleared until the module sets
this bit (11) in the status word.
These bits must be zero for a
valid configuration.
For the Channel Configuration
Word