SNAP-AILC OPTO 22, SNAP-AILC Datasheet - Page 3

• Manufacturer Part Number: SNAP-AILC
• Description: Load Cell Module
• Manufacturer: OPTO 22
• Type: Inputr

Specifications of SNAP-AILC

• Accessory Type: Load Cell Input Module, 10 VDC Excitation, 2 Or 3 MV/V Input Sensitivity
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Brand/series: SNAP Series
• Connection To Host: Backplane
• Current, Input: 40/115 mA
• Dimensions: 82.55mmL×18.29mmW×90.17mmH
• Input: 2/3 mV/V
• Input Type: Analog
• Input, Range: 2/3 mV/V
• Mounting Type: PCB
• Number Of Channels: 2
• Primary Type: Control
• Special Features: Transformer Isolation, Optical Isolation, Load Cell Input
• Voltage, Isolation: 4000/1500 V
• Voltage, Supply: 24 VDC
• For Use With: Snap I/O Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SNAP-AILC and SNAP-AILC-2 Configuration Options
Both modules can be configured as “Fast” or “Slow, ” depending on the response you need. Configure modules in PAC Control or
PAC Manager.
Using the Filter Weight and Fast Settling
Features
There are two channels of data on the SNAP-AILC and SNAP-
AILC-2 modules. The first channel provides raw Analog-to-
Digital (ADC) data, while the second channel provides filtered
data.
The filtered reading is calculated by the module from channel
1 data after every ADC conversion. Filtered output is calculated
as follows:
You configure filtering in PAC Control software using these
two commands: Set Analog Load Cell Filter Weight and Set
Analog Load Cell Fast Settle Level.
ADC Notch Filter
(Channel 1)
Data Freshness
(Channel 1)
Noise Reduction
(Channel 2)
Settle Time to %
of Final Reading
(Channel 2)
Ynew = ( (X - Y) / W ) + Y
Ynew =
Y =
X =
W =
SNAP Load Cell Modules
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new filtered reading
last filtered reading
new ADC reading =
filter weight (range: 1 to 255)
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Fast (Default)
60 Hz (-3 dB @ 125 Hz)
9 ms
At filter weight 64 (default):
-3 dB
T.C. = 567 ms
At filter weight 64 (default):
2.637 s to 99.0%
3.924 s to 99.9%
5.238 s to 99.99%
At filter weight 8:
-18 dB
T.C. = 72 ms
At filter weight 8:
0.31 s to 99.0%
0.47 s to 99.9%
0.62 s to 99.99%
Set Analog Load Cell Filter Weight
The Set Analog Load Cell Filter Weight command sets the filter
weight on channel 2 of a load cell module to a range of 1 to
255. Noise is reduced by up to 255, at the expense of settling
time.
For maximum resolution, set the filter weight to less than half
the peak-to-peak system noise as seen while trending the
data in PAC Display.
Set Analog Load Cell Fast Settle Level
The Set Analog Load Cell Fast Settle Level command sets the
fast settling trigger level (FSTL). The filtered weight is reduced
when the difference between the ADC data and the filtered
data is greater than the FSTL. This feature is useful to decrease
settling time when there are large step changes in the load
cell output and a large
filter weight.
For more information on the weight filtering and fast settling
features, see the commands Set Analog Load Cell Filter Level
and Set Analog Load Cell Fast Settle Level in the PAC Control
Command Reference (Opto 22 form #1701).
Slow (Configuration option)
20 Hz (-3 dB @ 42 Hz)
25.8 ms
At filter weight 64:
-3 dB
T.C. = 1626 ms
At filter weight 64:
7.56 s to 99.0%
11.25 s to 99.9%
15.00 s to 99.99%
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At filter weight 8:
-18 dB
T.C. = 206 ms
At filter weight 8:
0.9 s to 99.0%
1.3 s to 99.9%
1.8 s to 99.99%
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