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$405.00 (USA and Canada only)

Availability: In stock
SNAP Load Cell Input Module, 10 VDC Excitation, 3 or 4 mV/V Input Sensitivity

Production Specification

The SNAP-AILC-2 input module works with 3 mV/V and 4 mV/V load cells as a load cell front end. Using a separate 24 VDC power source (purchased separately), the module provides isolated 10 VDC bridge excitation for up to four 350 ohm or 415 ohm load cells.

An LED on the module’s top indicates that 24 VDC are present at the top connector and that excitation is being provided to the load cell.

The SNAP-AILC-2 is primarily used with high-quality 4 mV/V load cells to gather data from force measurement testing.

Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for PC-based control or for use as intelligent remote I/O for an Allen-Bradley Logix PLC system, such as ControlLogix, MicroLogix, or CompactLogix.

Also see the SNAP-AILC, which works with 2 mV/V and 3 mV/V load cells.

Build your system in the SNAP I/O Configurator.

Input Range Sensitivity:


2 mV/V or 3 mV/V (Over range ± 2.2 mV or ± 3.3 mV)
3 mV/V or 4 mV/V (Over range ± 3.3 mV or ± 4.4 mV)

Input Resistance

100 Megohms differential

Resolution: Analog Scale Points

>22 bits + sign (± 6,400,000 counts = ± 100% of scale)

Response Time,
Data Freshness

See the following table

DC Reversal (Input)

0.015% (±1000 counts of reading @ 6,400,000 F.S.)

DC Common Mode Rejection

>-120 dB

AC Common Mode Rejection

>-120 dB @ 60 Hz

Maximum Survivable Input

± 15 volts across module load cell connector

Maximum Operating Common Mode Voltage

250 V

Accuracy (% Full Scale):


± 0.05% (= 3,200 counts out of 6,400,000, out of box)
± 0.05% (= 3,200 counts out of 6,400,000, out of box)

Usable Resolution at Default Configuration (Fast)

38 nV - sign and 19 bits (±524,288 counts @ channel 2)
At filter weight 64, settles to 99.9% of final reading in 3.9 s.



40 PPM / °C
10 PPM / °C

Isolation: Optical

4000 V

Isolation: Transformer

1500 V

Rack Power Requirements

5.00 VDC to 5.20 VDC @ 120 mA

24V Bridge Supply:
 Input Voltage
 Input Current
 Output Fault Current


24 VDC nominal (22 V min. to 30 V max.)
40 mA for one load cell or 115 mA for four load cells
124 mA typical (field fault—shorted bridge)

Ambient Temperature:


-20 to 70 °C
-40 to 85 °C


5-95%, non-condensing

Wire size

22 to 14 AWG

Torque, hold-down screws

Not to exceed 1 in-lb (0.11 N-m)

Torque, connector screws

5.22 in-lb (0.59 N-m)

Agency Approvals




SNAP Load Cell Modules Data Sheet

The SNAP-AILC and SNAP-AILC-2 load cell input modules each provide one channel of transformer and optically isolated analog-to-digital conversion for load cell inputs. These modules also provide isolated 10 VDC bridge excitation for up to four 350 ohm load cells.

This data sheet includes descriptions, specifications, and wiring and dimensional diagrams.

SNAP PAC System Product Guide

This document lists and describes all current Opto 22 SNAP PAC System part numbers, including PAC Project software, SNAP PAC controllers, and SNAP I/O modules of all kinds. SNAP PAC mounting racks and SNAP power supplies are also listed.

Opto 22 RoHS 3 Statement of Compliance - Restriction of Hazardous Substances

This document is a statement of compliance with the EU Directive 2015/863/EU, Restriction of Hazardous Substances (RoHS 3). This document lists Opto 22 products that comply with the substance restrictions of the RoHS 3 directive.

CE Declaration: Low Voltage

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

No downloads are available for this product.

Video: SNAP PAC System Overview

This overview describes the four integrated components of the SNAP PAC system: software, controllers, brains and I/O. This hardware and software system is designed for industrial control, remote monitoring and data acquisition.

Video: Securing SNAP Module

A quick overview on securing a SNAP Module to a SNAP rack.

Video: Removing a SNAP Module

A quick overview on removing a SNAP module.

Accuracy vs Resolution

What's the difference between accuracy and resolution in analog I/O specifications? Try your own specs in the calculator.