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Availability: Obsolete
OBSOLETE SNAP 32-Ch -20mA to +20mA Analog Current Input Module

Production Specification

*** This product is obsolete and no longer available. ***
Please consider SNAP-AIMA-32 or contact Opto 22 Pre-Sales engineers for more information.

The SNAP-AIMA-32-FM provides 32 channels of -20 mA to +20 mA analog current input. The module does not supply loop excitation current. Although the 32 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.

CAUTION: We strongly recommend that you use the SNAP-AIMA-HDB breakout rack and SNAP-HD-BF6 wiring harness with this module. Miswiring of any point on the module can cause severe damage; the breakout rack protects the module from many wiring errors.

Compatibility: This module can be used only with SNAP PAC brains and R-series controllers. See SNAP-AIMA for a two-channel module that can also be used with legacy SNAP Ethernet and serial brains.

For a similar module that provides two isolated channels, see SNAP-AIMA-i.

For a module that provides two isolated channels and supplies loop excitation, see SNAP-AIMA-iSRC.

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

Input Filtering

-3 dB @ 31 Hz

Data Freshness (Max)

1.15 s

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


0.1% (20 microamps)

DRIFT: Gain Temperature Coefficient

30 PPM/ °C

DRIFT: Offset Temperature Coefficient

15 PPM/ °C


1500 V, field to logic

Power Requirements

5 VDC (±0.15 ) @ 150 mA

Input Resistance - Single Ended

100 ohms (each channel)

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

5.22 in-lb (0.59 N-m)

Agency Approvals




Obsolete SNAP Analog I/O Modules Technical Note

This technical note contains information you may need about OBSOLETE SNAP analog I/O modules you’re still
using. Included are part numbers, descriptions, specifications, wiring diagrams, and dimensional drawings.
These parts have been removed from data sheets because we no longer sell them.

This document includes information on the following obsolete SNAP analog I/O modules:

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.