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Availability: Obsolete
OBSOLETE SNAP Isolated 2-Ch 0-250 V RMS AC/DC Analog Input Module

Production Specification

*** NOTE: This part is OBSOLETE and no longer available. ***
Please consider SNAP-AIVRMS-i or contact Opto 22 Pre-Sales engineers for more information.

The SNAP-AIVRMS-i-FM module provides two isolated channels with an input range of 0 to 250 volts AC or DC. The SNAP-AIVRMS-i-FM module may be used to monitor 120/240-volt AC/DC and 12/24/48-volt AC/DC system voltage and is ideal for differential voltage measurements.

The two channels are isolated from each other; they do not share any field connection.

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.

If you do not need isolated channels, see SNAP-AIVRMS.

Build your system in the SNAP I/O Configurator.
*** NOTE: This part is OBSOLETE and no longer available. ***

Input Range

0 to 250 V RMS AC/DC

Input Over Range

To 275 V

Input Resistance

1 megohms


±0.2 V and ±0.2% reading


10 mV

DC Reversal

± 0.2 V (0.08%)

Input Response Time
(Step Change)

63.2% (158 V) in 50 ms
99% (248 V) in 75 ms

Data Freshness

0.025 s

DC Common Mode Rejection

>-120 dB

AC Common Mode Rejection

>-120 dB @ 60 Hz

Maximum Operating
  Voltage Between Channels
  Common Mode Voltage


250 V
250 V

Isolation: Optical

4000 V

Isolation: Transformer

1500 V

Isolation: Channel to Channel

250 V continuous
(1500 V transient)

Power Requirements

5 VDC (±0.15 V) at 200 mA

Ambient Temperature:


-20 °C to 70 °C
-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)

Wire size range

22 to 14 AWG

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.