--- title: "OptoNews Tip: Compare SNAP PAC controllers and brains" description: SNAP PAC controllers and brains may look alike and even share some functions, but they are different. 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Let's take a look at how SNAP PAC controllers and brains are similar and how they're different.   ### Controllers vs. brains At Opto 22, the big difference between a controller and what we call a *brain* is the ability to run a control program (a *strategy*). A control strategy you've built can run locally on a controller; it can't on a brain.  Both controllers and brains are intelligent, though. The brain has a number of features built in that provide local intelligence, but they don't require programming (more about that later). All SNAP PAC controllers and most brains communicate over Ethernet and have two Ethernet network interfaces. But they're different in [how the two interfaces function](https://blog.opto22.com/optoblog/optonews-tip-two-ethernet-interfaces-different-on-pacs-brains). SNAP PAC controllers ![Opto 22 SNAP PAC S-series controllers](https://blog.opto22.com/hs-fs/hubfs/social-suggested-images/choosing_a_pac_224x144-4.jpg?width=224&name=choosing_a_pac_224x144-4.jpg "Opto 22 SNAP PAC S-series controllers")You already know what a controller is. Opto 22's are **programmable automation controllers** (the *PAC* in SNAP PAC), which means they're essentially small multifunction computers that you program to do what you want. That might be monitoring sensors and devices, controlling anything from a light bulb to an entire factory, or acquiring data from real-world things so you can use that data elsewhere. Or all three at once. You program SNAP PAC controllers using Opto 22's [PAC Control](http://www.opto22.com/site/pr_details.aspx?cid=1&item=PACCONTROLBAS), a flowchart-based programming environment with optional scripting. Scripting is appreciated by engineers who have programming experience, while flowcharting is pretty easy for anyone to pick up. (And you can attend [free, hands-on training](http://www.opto22.com/site/training.aspx) at our factory and headquarters in Temecula, California.) In addition, multitasking hardware SNAP PACs run over Ethernet and know a lot of protocols, all of which can be used simultaneously (great for interoperability and system integration): - TCP/IP, UDP/IP - EtherNet/IP™ (Allen-Bradley® RSLogix® systems and others) - Modbus®/TCP - OPC driver support - RESTful API - HTTP/HTTPS - SNMP - FTP (client and server) - Email (SMTP client with authentication and attachments) Did you notice the [RESTful API](https://info.opto22.com/snap-pac-rest-api-thank-you) in that list? Yes, our hardware PACs have an application program interface (API) based on the REST architecture, so you can write custom programs in a wide variety of languages (to read from or even write to the controller's variables and the I/O it's connected to).  SNAP PAC brains ![SNAP PAC brains](https://blog.opto22.com/hs-fs/hubfs/Products/snap_brain_metal_base_nbg_464x439.png?width=200&name=snap_brain_metal_base_nbg_464x439.png "SNAP PAC brains")A **SNAP PAC brain** mounts on a rack next to [SNAP input/output (I/O) modules](http://www.opto22.com/lp/io.aspx)—analog, digital, and/or serial, all on the same rack. The I/O is wired directly to sensors and equipment, and the brain processes information between I/O and the controller or a custom software program you build.  The brain also provides local intelligence. Built-in brain features include: latching, totalizing, watchdogs, pulsing, ramping, clamping, thermocouple linearization, TPO, scaling, PID loop control, and more. Some of these features are automatic; some require a little configuration. But none of them requires any programming. Because these features run locally on the brain, they provide two advantages: - They reduce network traffic. - They continue to run (or stop safely, as you determine) even if the brain loses communication with the controller. Like our controllers, SNAP PAC brains are flexible in the protocols they support. Ethernet-based EB brains can be used with Allen-Bradley PLCs and other automation systems, because they support: - TCP/IP, UDP/IP - EtherNet/IP - Modbus/TCP - OPC driver support - SNMP - FTP (server only) ### Choose your controller or brain SNAP PAC controllers and brains include: - [SoftPAC](http://www.opto22.com/site/pr_details.aspx?cid=1&item=SOFTPAC)—Software-based controller that runs on a PC and gives you PC-based control of I/O (Note: Protocols are more limited than on hardware PACs.) - [S-series PACs](http://www.opto22.com/site/pr_selector.aspx?cid=1&qs=100210241043)—Powerful, small-footprint hardware controllers that don't need a mounting rack - [R-series PACs](http://www.opto22.com/site/pr_selector.aspx?cid=1&qs=100210241055)—Hardware controllers that mount on an I/O rack (An R-series PAC is both a controller and a brain; it runs a control program and also acts as a brain for the I/O on its rack.) - [EB brains](http://www.opto22.com/site/pr_selector.aspx?cid=1&qs=1003100610441018)—I/O processors that mount on an I/O rack and communicate over Ethernet - [SB brains](http://www.opto22.com/site/pr_selector.aspx?cid=1&qs=1003100610443006)—I/O processors that mount on an I/O rack and communicate over serial For complete details on features for all of these, see the recently updated [SNAP PAC Controller & Brain Comparison Chart](http://www.opto22.com/site/documents/doc_drilldown.aspx?aid=3152). [![Compare SNAP PAC controllers & brains](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/439485/8fd0ec4a-9dac-4aeb-ab0b-55286bcd23e9.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/439485/8fd0ec4a-9dac-4aeb-ab0b-55286bcd23e9) Topics: [Tips](https://blog.opto22.com/optoblog/topic/tips), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [I/O](https://blog.opto22.com/optoblog/topic/io), [API](https://blog.opto22.com/optoblog/topic/api), [REST API](https://blog.opto22.com/optoblog/topic/rest-api) ### 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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