--- title: "OptoNews Tip: Choosing the right SNAP I/O module" description: You know your application, but what's the best I/O module for it? Here are some ways to compare SNAP I/O and find what you need. image: https://blog.opto22.com/hubfs/snap_io_table_540x391.png --- - [Log in](https://www.opto22.com/logon?returnurl=%2f) - [Register](https://www.opto22.com/Special-Pages/Logon.aspx) - [Your Cart](https://www.opto22.com/Checkout/Shopping-Cart) - [Contact Us](https://www.opto22.com/support/contact-us) [![Opto 22 Logo](https://blog.opto22.com/hubfs/opto22_lightsilvergradient_800px.png "Opto 22 Logo")](https://www.opto22.com) - [Products](https://www.opto22.com/products) - [What Do You Want to Do?](https://www.opto22.com/products/what-do-you-want-to-do) - [groov RIO](https://www.opto22.com/products/groov-rio) - [groov EPIC System](https://www.opto22.com/products/groov-epic-system) - [Case Studies](https://www.opto22.com/products/groov-case-studies) - [Product Selector](https://www.opto22.com/products/product-selector) - [Product Families](https://www.opto22.com/products/product-families) - [IIoT System Architecture](https://www.opto22.com/support/resources-tools/demos/groov-epic-groov-rio-architecture) - 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[Education Partnerships](https://info.opto22.com/partnering-in-education) - [Opto Blog](https://blog.opto22.com/) - [Opto Forums](http://forums.opto22.com/) - [Events](https://www.opto22.com/community/events) - [Articles](https://www.opto22.com/articles) - [Log In](https://www.opto22.com/logon) - [Register](https://www.opto22.com/Special-Pages/Logon.aspx) - [Your Cart](https://www.opto22.com/Checkout/Shopping-Cart) - [Contact Us](https://www.opto22.com/support/contact-us)   # OptoNews Tip: Choosing the right SNAP I/O module # OptoBlog # OptoNews Tip: Choosing the right SNAP I/O module Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Jun 12, 2017, 8:50:54 AM - [Tweet](https://twitter.com/share) ![SNAP I/O module](https://blog.opto22.com/hs-fs/file-2555238802.png/blog-files/SNAP-AILC-2_p1_200.png?width=200&name=SNAP-AILC-2_p1_200.png "SNAP I/O module")Maybe you're monitoring temperature, or controlling a production line, or getting data from a load cell. Whatever your goal, you want to get the I/O that works best for your application.  Or maybe you happen to notice we have more than one SNAP-AIV voltage input module and wonder how they're different.  Here are a couple of ways to find a SNAP module with the features you need and compare similar modules. ### Specification Guide Maybe the best place to start is with the [SNAP PAC System Specification Guide](http://www.opto22.com/site/documents/doc_drilldown.aspx?aid=3325) (form 1696). In here you'll find details on all four parts of the SNAP PAC System—software, controllers, brains, and I/O—as well as architectural diagrams and networking options for the whole system. But if you're interested only in I/O right now, head straight for the section "Choosing I/O" in Chapter 2. You'll see comparison tables for digital (discrete) inputs, digital outputs, analog inputs, analog outputs, and serial communication modules. Here's an example: [![SNAP Digital Inputs comparison table](https://blog.opto22.com/hs-fs/hubfs/snap_io_table_540x391.png?width=540&name=snap_io_table_540x391.png "SNAP Digital Inputs comparison table")](http://www.opto22.com/site/documents/doc_drilldown.aspx?aid=3325) Start in the left column with the input signal type and range you need. Read across to see the part number and its features. To see detailed specifications for this module, you can click the page number in the last column on the right.  ### SNAP I/O Configurator Here's a way that's more fun: choose your I/O in the [SNAP I/O Configurator](https://www.opto22.com/products/system-configurator). You can build your whole I/O unit—rack, processor, and I/O modules, plus accessories—in this interactive tool. Then you can save the configuration for later, send it to your distributor for a quote, or buy it online.  The Configurator also helps you choose your module based on the signal type and range you need.  Start by opening the [Configurator](https://www.opto22.com/products/system-configurator). Then follow the numbered steps in the image below. **1.** Click the I/O Modules tab at the top. **2.** In the chooser at left, click your signal and range. What you click is highlighted in dark orange, and the additional filter possibilities are shown in other columns in lighter orange.  **3.** In the middle column, you'll see the part numbers that match the dark orange choices. To see more about one of these part numbers, click it. **4.** Details (including a wiring diagram) appear below.  **5.** For a description and specifications, click the "Show web page" button. You'll go to the product's page on our website; for specs, click the Specifications tab on the page.  [![SNAP I/O Configurator helps you choose your I/O module](https://blog.opto22.com/hs-fs/hubfs/snap_io_config_600x429.png?width=600&name=snap_io_config_600x429.png "SNAP I/O Configurator helps you choose your I/O module")](http://www.opto22.com/site/fd_snappacconfigurator.aspx) Back in the Configurator, if you click the Add to I/O Unit button, the I/O module you chose is placed on the rack image at right. This is how you can build an entire I/O unit, including modules, processor, and accessories you choose from the tabs in the chooser on the left. To save your I/O unit and see other options, click the Save Configuration button in the top right of the Configurator. You'll need a free [My.Opto account](https://www.opto22.com/) to save.  ### [![Opto 22 Pre-Sales Engineers are happy to help you](https://blog.opto22.com/hs-fs/hubfs/Opto/kyle_224p.png?width=120&name=kyle_224p.png "Opto 22 Pre-Sales Engineers are happy to help you")](http://www.opto22.com/site/qbeforeyoub.aspx)Questions? These are a couple of good ways to find the SNAP I/O modules you need. But as always, if you have more questions about what products are best for your application, [contact our Pre-Sales engineers](https://www.opto22.com/support/contact-us).  We're happy to help.    Topics: [Energy management](https://blog.opto22.com/optoblog/topic/energy-management), [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Discrete control](https://blog.opto22.com/optoblog/topic/discrete-control), [Tips](https://blog.opto22.com/optoblog/topic/tips), [Machine builder](https://blog.opto22.com/optoblog/topic/machine-builder), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [OEM](https://blog.opto22.com/optoblog/topic/oem), [Integrators](https://blog.opto22.com/optoblog/topic/integrators), [I/O](https://blog.opto22.com/optoblog/topic/io), [Data acquisition](https://blog.opto22.com/optoblog/topic/data-acquisition) ### Written by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) Jean Femia writes about technical subjects and has focused on automation and control systems for more than 15 years. She likes learning about technology and taking corners in her Honda S2000. 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