--- title: Upgrade with SNAP-PAC-R1-B controller for B-series racks description: Upgrade to the latest SNAP PAC System, keeping existing racks and field wiring intact --- - [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://info.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) - 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Now you can upgrade these I/O units to SNAP PAC with the new [SNAP-PAC-R1-B](http://www.opto22.com/site/pr_details.aspx?cid=1&item=SNAP-PAC-R1-B). The SNAP-PAC-R1-B combines a controller and brain in one compact package. The SNAP-PAC-R1-B is exactly like a regular SNAP-PAC-R1 except that it has a blue connector on the bottom that fits on a B-series rack. That means you can: - **Replace** a SNAP Ultimate or SNAP Ethernet brain with the new R1-B while keeping the same rack and field wiring. - Add the newest [SNAP I/O modules](https://www.opto22.com/products/product-selector?keyword=&c1=&c2=&tag=1558) to your B-series rack—like 16-point digital modules, 8-channel analog input modules, additional serial communication modules, and the [8-channel multifunction SNAP-AOVA-8](http://www.opto22.com/site/pr_details.aspx?cid=1&item=SNAP-AOVA-8) analog output module. - Run a PAC Control strategy on the new R1-B or use it as a powerful brain. - Communicate directly with other systems and equipment that use EtherNet/IP (for example, Allen-Bradley® **PLC systems**). - Use local, **removable data storage** through the PAC's built-in microSD slot that takes microSDHC cards up to 32 GB. - Set up link redundancy using the R1-B's two independent Ethernet network interfaces. - Take advantage of the R1-B's integrated FPU (floating-point unit) and substantially larger battery-backed RAM. AND: - **Securely access I/O and strategy variable data** using the PAC's built-in HTTP/HTTPS server and [RESTful API](https://info.opto22.com/snap-pac-rest-api-thank-you)—ideal for Industrial Internet of Things (IIoT) applications and custom programs. - **Securely monitor and control** your older systems and equipment from your smartphone or tablet with a [*groov* mobile operator interface](https://www.opto22.com/products/groov). No programming and no coding.  ## What can you replace? The SNAP-PAC-R1-B is designed to replace the following: - SNAP-UP1-ADS (analog/digital/serial SNAP Ultimate controller/brain) - SNAP-B3000-ENET (SNAP Ethernet brain) These are legacy products: we still fully support them, but we do not recommend them for new designs. (Note that the R1-B does not work on a SNAP-D64RS all-digital rack. It is designed for a B-series rack with a B in the part number.) ### Compare legacy and current SNAP products See the [Legacy and Current SNAP Product Comparison and Compatibility Charts](http://www.opto22.com/site/documents/doc_drilldown.aspx?aid=3135) for detailed differences between the new SNAP-PAC-R1-B and the rack-mounted controller or brain you have now. [![SNAP-AITM-4i 4-channel isolated thermocouple or millivolt analog input module](https://info.opto22.com/hs-fs/hubfs/Products/SNAP-AITM-4i_309x450.png?width=112&name=SNAP-AITM-4i_309x450.png "SNAP-AITM-4i 4-channel isolated thermocouple or millivolt analog input module")](http://www.opto22.com/site/pr_details.aspx?cid=1&item=SNAP-AITM-4i)Be sure to see I/O module support on the last page of the document. **At least 25 new I/O modules** not supported by SNAP Ultimate or SNAP Ethernet brains can now be used with the SNAP-PAC-R1-B on a B-series rack. **NOTE: Remember** that the B-series rack limits where you can place 4-point digital modules: only in the first eight positions (slots 0-7). The new PAC does not change this limitation. Analog, high-density digital, and serial modules can be placed anywhere on the rack. For detailed information about **migrating** to the SNAP PAC System—options, advantages, and gotchas—see the [SNAP PAC System Migration Technical Note](http://www.opto22.com/site/documents/doc_drilldown.aspx?aid=3149). As you skim through it, you'll see how much the SNAP-PAC-R1-B simplifies your migration tasks. ## Questions? Contact us. [![Opto 22 Pre-sales engineer Kyle Orman](https://info.opto22.com/hs-fs/hubfs/Opto/kyle_224p.png?width=120&name=kyle_224p.png "Opto 22 Pre-sales engineer Kyle Orman")](http://www.opto22.com/site/qbeforeyoub.aspx?nid=nr2)Feel free to contact our [Pre-sales engineers](https://www.opto22.com/support/contact-us) or Opto 22 [Product Support](http://www.opto22.com/site/support.aspx) with any questions about upgrading your system or using the new I/O modules. 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