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$97.25 (USA and Canada only)

Availability: In stock
SNAP 4-Ch Contact Status Input Module, Normally Closed

Production Specification

The SNAP-IDC5-SW-NC module provides four channels of contact status input. The module supplies 15 volts of power to an external dry contact switch and senses when the switch opens. Each user-supplied switch is connected with two wires. Because the module includes power for the switch, it is particularly cost-effective when labor costs for wiring external power are high.

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.

For easier, faster wiring, see SNAP TEX cables and breakout boards.

Build your system in the SNAP I/O Configurator.

Field Side Ratings (each channel)

Open Circuit Voltage (Switch Open)

15 VDC typical

Short Circuit Current (Switch Closed)

7 milliamps nominal

Minimum Off Resistance

>20 K ohms

Maximum Allowable On Resistance (Wire + Con­tact Resistance)

500 ohms

Logic Side Ratings

Logic Output Voltage for
(normally open)

<0.5 V max. (switch closed; LED on)
@ 2 mA sinking
2.7 V min. (switch open; LED off)
@ 0.4 mA sourcing

Logic Output Voltage for
(normally closed)

<0.5 V max.(switch closed; LED off)
@ 2 mA sinking
2.7 V min. (switch open; LED on)
@ 0.4 mA sourcing

Maximum Operating Common Mode Voltage (Field Term to Logic Con­nector)

250 V

Power Requirements

5 VDC (±0.25) @ 200 mA

Module Ratings

Number of Channels Per Module


Turn-on Time

5 msec

Turn-off Time

25 msec

Channel-to-channel Isola­tion


Input-to-output Isolation

1500 V AC/DC

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)


-20 °C to 70 °C, operating
-40 °C to 85 °C, storage

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 Digital Input Modules Data Sheet

SNAP digital input modules are designed to work with SNAP PAC racks and can sense either AC or DC signals.

All SNAP digital input modules are compatible with SNAP PAC brains and R-series controllers, including Wired+Wireless models.

Most digital input modules are also compatible with SNAP D-series or legacy M-series and B-series racks and with the brains that mount on them.

This data sheet applies to:

Digital I/O for Raspberry Pi Selection Guide

Now you can safely and reliably sense and switch industrial-level electrical loads with your Raspberry Pi® and Opto 22 industrially hardened digital I/O.

This Selection Guide describes compatible I/O racks and modules, power supplies, and accessories that work with the Raspberry Pi and the Digital I/O Carrier Board for the Pi (OPTO-P1-40P). Specifications, dimensional drawings, and wiring diagrams for racks and I/O modules are included.

For code samples and steps to get started, also see

UKCA Declaration of Conformity (EMC, LVD, RoHS)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with the rules, regulations and standards of the United Kingdom. The models cited have been tested to the essential requirements listed in the Standards section, and fully comply with the legislation as listed in UK Legislation section.

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.

CAD Drawing: SNAP I/O Module

This CAD file includes drawings that apply to most SNAP analog and digital I/O modules.

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.