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$632.00 (USA and Canada only)

Availability: In stock
SNAP 8-Ch -20mA to +20mA Analog Current Input Module

Production Specification

The SNAP-AIMA-8 provides eight channels of -20 mA to +20 mA current input. The module does not supply loop excitation current. Although the eight channels are not isolated from each other, the module is transformer isolated and optically isolated from other modules and devices.

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.

Compatibility: This module can be used only with SNAP PAC R-series controllers, SNAP PAC EB-series Ethernet brains, and SNAP PAC SB-series serial brains.

NOTE: This module does not provide channel-to-channel isolation. If you need an isolated module, see the two-channel SNAP-AIMA-i module.

Build your system in the SNAP I/O Configurator.

Input Range

-20 mA to +20 mA

Over-Range Limits

From -22 to +22 mA
(+/-20 mA range)


0.8 microamps

Data Freshness (Max)

0.28 seconds

DC Common Mode Rejection

>-120 dB

AC Common Mode Rejection

>-120 dB @ 60 Hz

Maximum Survivable Input

36 mA or 9 VDC

Maximum Operating Common Mode Voltage

250 V


0.05% (10 microamps)

DRIFT: Gain Temperature Coefficient

30 PPM/ °C

DRIFT: Offset Temperature Coefficient

15 PPM/ °C


1500 V

Power Requirements

5 VDC (±0.15 ) @ 170 mA

Input Resistance - Single Ended

100 ohms (all channels share the same reference point)

Operating Temperature

-20 °C to 70 °C

Storage Temperature

-40 °C to 85 °C


5-95%, non-condensing

Torque, hold-down screws

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

Torque, connector screws

1.7 in-lb (0.19 N-m)

Agency Approvals




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.

SNAP Analog Input Modules Data Sheet

SNAP I/O analog input modules are part of Opto 22's SNAP PAC System. This document includes descriptions, specifications, and wiring and dimensional diagrams for the following analog input modules:

For analog modules with channel-to-channel isolation, see Form 1182, the SNAP Isolated Analog Input Modules Data Sheet.

Case Study: AAQUA NV

Antwerp-based AAQUA NV has specialized in engineering and constructing industrial wastewater treatment plants since 1999, with customers all over the world. Where possible, the company also adds value to customer waste, either by recycling wastewater to drinking water quality or by capturing the energy in the water to reduce fuel costs.

Initially AAQUA often worked with a subcontractor to automate treatment, but in 2005 they began offering automation themselves. To do so, the small company needed an automation system that was Ethernet based, flexible, reliable, offered remote access, and was easy to learn.

In this case study, read how they found that system and how they use it today. 

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.

UL Approval Document

This document lists all Opto 22 part numbers that have the Underwriters Laboratory (UL) approval.

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.