--- title: OptoBlog | PLCs description: PLCs | --- - [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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[Privacy Policy](https://www.opto22.com/support/privacy) - [About Us](https://www.opto22.com/about-us) - [History](https://www.opto22.com/about-us/history) - [Location](https://www.opto22.com/about-us/directions) - [Corporate Contacts](https://www.opto22.com/about-us/corporate-contacts) - [Opto 22 Product Philosophy](https://www.opto22.com/about-us/opto-22-product-philosophy) - [Customer Quotes/Testimonials](https://www.opto22.com/about-us/customer-quotes-testimonials) - [Virtual Tour](https://www.opto22.com/about-us/virtual-tour) - [Pressroom](https://www.opto22.com/about-us/pressroom) - [Distributors](https://www.opto22.com/about-us/distributors) - [International](https://www.opto22.com/about-us/international) - [Sustainability](https://www.opto22.com/about-us/sustainability) - [Careers](https://www.opto22.com/about-us/careers) - [Community](https://www.opto22.com/community) - [OptoPartners](https://www.opto22.com/community/opto-partners) - [Technology Partners](https://www.opto22.com/community/technology-partners) - [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)   # OptoBlog # OptoBlog ## [Water utilities got hacked—get your PLCs off the public internet](https://blog.opto22.com/optoblog/water-utilities-got-hacked-get-your-plcs-off-the-public-internet) Posted by [Dan White](https://blog.opto22.com/optoblog/author/dan-white) on Aug 19, 2026, 7:25:35 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/CyberBlog_MinnesotaCyberAttack.png)](https://blog.opto22.com/optoblog/water-utilities-got-hacked-get-your-plcs-off-the-public-internet) ### Last month's water-utility attacks hit exposed PLCs. Here's how to tell if yours is one, and how to take it offline for good. Somewhere in your plant or remote infrastructure, a controller might be reachable from the public internet right now. Someone probably set up remote access years ago so they wouldn't have to drive an hour out to a remote site every time it needed a look. Nobody circled back. For a long time, that felt harmless. Last month, it stopped feeling that way. [Read More](https://blog.opto22.com/optoblog/water-utilities-got-hacked-get-your-plcs-off-the-public-internet) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/water-utilities-got-hacked-get-your-plcs-off-the-public-internet#comments-listing) Topics: [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [groov EPIC](https://blog.opto22.com/optoblog/topic/groov-epic), [cybersecurity](https://blog.opto22.com/optoblog/topic/cybersecurity), [groov RIO](https://blog.opto22.com/optoblog/topic/groov-rio) ## [Latest OptoPartner Video - RDI Controls](https://blog.opto22.com/optoblog/latest-optopartner-video-rdi-controls) Posted by [Arun Sinha](https://blog.opto22.com/optoblog/author/arun-sinha) on Apr 28, 2021, 1:30:00 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/RDI.jpg)](https://blog.opto22.com/optoblog/latest-optopartner-video-rdi-controls) ### Experienced S.I. harnesses the power of Opto 22’s control system. One thing is for sure -- RDI Controls knows turbine and governor control systems. That said, if you are looking for an experienced Opto 22 systems integrator that can tackle most any application, have a look at our latest [OptoPartner video](https://www.opto22.com/community/opto-partners/rdi-controls-llc).  [Read More](https://blog.opto22.com/optoblog/latest-optopartner-video-rdi-controls) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/latest-optopartner-video-rdi-controls#comments-listing) Topics: [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [PAC Control](https://blog.opto22.com/optoblog/topic/pac-control), [PID loop control](https://blog.opto22.com/optoblog/topic/pid-loop-control), [groov EPIC](https://blog.opto22.com/optoblog/topic/groov-epic), [industrial automation](https://blog.opto22.com/optoblog/topic/industrial-automation), [snap pac](https://blog.opto22.com/optoblog/topic/snap-pac), [OptoPartner](https://blog.opto22.com/optoblog/topic/optopartner), [OptoPartner video](https://blog.opto22.com/optoblog/topic/optopartner-video) ## [Podcast: Integrating Edge Computing with Legacy Systems](https://blog.opto22.com/optoblog/podcast-integrating-edge-computers-with-legacy-systems) Posted by [Janice Colmer](https://blog.opto22.com/optoblog/author/janice-colmer) on Jan 28, 2020, 9:22:19 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/social-suggested-images/blog.opto22.comhubfsAW_podcast_scada-4.png)](https://blog.opto22.com/optoblog/podcast-integrating-edge-computers-with-legacy-systems) ### Listen in as Opto 22's Josh Eastburn and Benson Hougland discuss edge computing concepts with *Automation World's* Dave Greenfield. *Automation World* continues its informative podcast series "Get Your Questions Answered" with an all new podcast for 2020. This podcast series connects with industry experts to answer the questions of automation tech users across the process and discrete manufacturing industries.  [Read More](https://blog.opto22.com/optoblog/podcast-integrating-edge-computers-with-legacy-systems) 1 Comment [Click here to read/write comments](https://blog.opto22.com/optoblog/podcast-integrating-edge-computers-with-legacy-systems#comments-listing) Topics: [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [groov EPIC](https://blog.opto22.com/optoblog/topic/groov-epic), [Automation World](https://blog.opto22.com/optoblog/topic/automation-world), [podcast](https://blog.opto22.com/optoblog/topic/podcast), [edge computing](https://blog.opto22.com/optoblog/topic/edge-computing) ## [Order your new groov EPIC system starting now](https://blog.opto22.com/optoblog/pre-order-your-new-groov-epic-system) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Mar 26, 2018, 12:01:00 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hs-fs/hubfs/social-suggested-images/groovEPIC.png?t=1521655212922&width=280&name=groovEPIC.png)](https://blog.opto22.com/optoblog/pre-order-your-new-groov-epic-system) Opto 22's ***groov* EPIC® system** starts shipping on May 18. **You can start ordering now!** Pre-orders will ship first, and based on early feedback from several EPIC Roadshows, this new system will be in high demand. Customers are excited about the built-in features of *groov* EPIC, not only for IIoT applications but for all automation and data acquisition applications. Here are just a few of these features: [Read More](https://blog.opto22.com/optoblog/pre-order-your-new-groov-epic-system) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/pre-order-your-new-groov-epic-system#comments-listing) Topics: [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Discrete control](https://blog.opto22.com/optoblog/topic/discrete-control), [groov](https://blog.opto22.com/optoblog/topic/groov), [Internet of Things](https://blog.opto22.com/optoblog/topic/internet-of-things), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [Remote monitoring](https://blog.opto22.com/optoblog/topic/remote-monitoring), [IoT](https://blog.opto22.com/optoblog/topic/iot), [Machine builder](https://blog.opto22.com/optoblog/topic/machine-builder), [New products](https://blog.opto22.com/optoblog/topic/new-products), [Integrators](https://blog.opto22.com/optoblog/topic/integrators), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Control](https://blog.opto22.com/optoblog/topic/pac-control), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [Industrial Internet of Things](https://blog.opto22.com/optoblog/topic/industrial-internet-of-things), [Node-RED](https://blog.opto22.com/optoblog/topic/node-red), [Data acquisition](https://blog.opto22.com/optoblog/topic/data-acquisition), [MQTT](https://blog.opto22.com/optoblog/topic/mqtt), [Ignition Edge](https://blog.opto22.com/optoblog/topic/ignition-edge), [EPIC](https://blog.opto22.com/optoblog/topic/epic) ## [groov EPIC data sheets now available](https://blog.opto22.com/optoblog/preliminary-groov-epic-data-sheets-now-available) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Feb 15, 2018, 10:10:52 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/social-suggested-images/groovEPIC-8-front-300dpi-300x200.png)](https://blog.opto22.com/optoblog/preliminary-groov-epic-data-sheets-now-available) You've been asking for more details about our [brand-new *groov* EPIC® system](https://blog.opto22.com/optoblog/youre-the-first-to-know-about-our-epic-announcement) for the IIoT and automation, and here they are!  We just published a part numbers list and the first several data sheets, with preliminary descriptions, specs, wiring diagrams, and dimensions. So take a look and start planning the system you want.  [Read More](https://blog.opto22.com/optoblog/preliminary-groov-epic-data-sheets-now-available) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/preliminary-groov-epic-data-sheets-now-available#comments-listing) Topics: [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Discrete control](https://blog.opto22.com/optoblog/topic/discrete-control), [groov](https://blog.opto22.com/optoblog/topic/groov), [Internet of Things](https://blog.opto22.com/optoblog/topic/internet-of-things), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [Remote monitoring](https://blog.opto22.com/optoblog/topic/remote-monitoring), [IoT](https://blog.opto22.com/optoblog/topic/iot), [Machine builder](https://blog.opto22.com/optoblog/topic/machine-builder), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [OEM](https://blog.opto22.com/optoblog/topic/oem), [New products](https://blog.opto22.com/optoblog/topic/new-products), [Integrators](https://blog.opto22.com/optoblog/topic/integrators), [I/O](https://blog.opto22.com/optoblog/topic/io), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [Industrial Internet of Things](https://blog.opto22.com/optoblog/topic/industrial-internet-of-things), [Data acquisition](https://blog.opto22.com/optoblog/topic/data-acquisition), [EPIC](https://blog.opto22.com/optoblog/topic/epic) ## [You're the first to know...about our EPIC announcement!](https://blog.opto22.com/optoblog/youre-the-first-to-know-about-our-epic-announcement) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Feb 12, 2018, 9:52:04 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/groovEPIC.png)](https://blog.opto22.com/optoblog/youre-the-first-to-know-about-our-epic-announcement) When we announce a new product, we want you—our loyal customers and OptoBlog readers—to be the first to hear about it.  And this isn't just one product. This is **EPIC**: the world's first **Edge Programmable Industrial Control system**—a brand-new I/O and control system built for the future of automation and designed for the way you work. [Read More](https://blog.opto22.com/optoblog/youre-the-first-to-know-about-our-epic-announcement) 7 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/youre-the-first-to-know-about-our-epic-announcement#comments-listing) Topics: [Energy management](https://blog.opto22.com/optoblog/topic/energy-management), [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Food & beverage](https://blog.opto22.com/optoblog/topic/food-amp-beverage), [Discrete control](https://blog.opto22.com/optoblog/topic/discrete-control), [groov](https://blog.opto22.com/optoblog/topic/groov), [Internet of Things](https://blog.opto22.com/optoblog/topic/internet-of-things), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [Remote monitoring](https://blog.opto22.com/optoblog/topic/remote-monitoring), [Water & wastewater](https://blog.opto22.com/optoblog/topic/water-amp-wastewater), [IoT](https://blog.opto22.com/optoblog/topic/iot), [Machine builder](https://blog.opto22.com/optoblog/topic/machine-builder), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [OEM](https://blog.opto22.com/optoblog/topic/oem), [New products](https://blog.opto22.com/optoblog/topic/new-products), [Integrators](https://blog.opto22.com/optoblog/topic/integrators), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [Building management](https://blog.opto22.com/optoblog/topic/building-management), [Oil & gas](https://blog.opto22.com/optoblog/topic/oil-gas), [PAC Control](https://blog.opto22.com/optoblog/topic/pac-control), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [Industrial Internet of Things](https://blog.opto22.com/optoblog/topic/industrial-internet-of-things), [Node-RED](https://blog.opto22.com/optoblog/topic/node-red), [Data acquisition](https://blog.opto22.com/optoblog/topic/data-acquisition), [MQTT](https://blog.opto22.com/optoblog/topic/mqtt), [Ignition Edge](https://blog.opto22.com/optoblog/topic/ignition-edge), [EPIC](https://blog.opto22.com/optoblog/topic/epic) ## [Your IoT middleware checklist](https://blog.opto22.com/optoblog/your-iot-middleware-checklist) Posted by [Matt Newton](https://blog.opto22.com/optoblog/author/matt-newton) on Mar 2, 2017, 8:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/anatomy-1751201-3.png)](https://blog.opto22.com/optoblog/your-iot-middleware-checklist) In a recent [developer survey](http://iot.ieee.org/images/files/pdf/iot-developer-survey-2016-report-final.pdf) conducted by the Eclipse IoT Working Group, IEEE IoT, and Agile IoT, 40.8% of respondents indicated that the IoT solutions they were either currently building or planning to build are IoT platforms or IoT middleware. Almost every large IT or OT company today has some form of IoT platform or middleware. In fact, right now there are over 150 self-described IoT platforms in the market today. Not neccessarily created equally. [Read More](https://blog.opto22.com/optoblog/your-iot-middleware-checklist) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/your-iot-middleware-checklist#comments-listing) Topics: [Energy management](https://blog.opto22.com/optoblog/topic/energy-management), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [IoT](https://blog.opto22.com/optoblog/topic/iot), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [REST](https://blog.opto22.com/optoblog/topic/rest), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [Node-RED](https://blog.opto22.com/optoblog/topic/node-red) ## [Debugging your industrial network with Wireshark](https://blog.opto22.com/optoblog/debugging-your-industrial-network-with-wireshark) Posted by [Matt Newton](https://blog.opto22.com/optoblog/author/matt-newton) on Feb 28, 2017, 8:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/wireshark.png)](https://blog.opto22.com/optoblog/debugging-your-industrial-network-with-wireshark) Note that the information below applies not only to PCs, PACs, and PLCs, but to pretty much any industry-standard compliant network device. There are a ton of great network analysis tools out there today that you can pay huge sums of money for. But a go-to industry standard, and my tool of choice for everyday network troubleshooting, is a free piece of software called Wireshark. [Read More](https://blog.opto22.com/optoblog/debugging-your-industrial-network-with-wireshark) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/debugging-your-industrial-network-with-wireshark#comments-listing) Topics: [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [IoT](https://blog.opto22.com/optoblog/topic/iot), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [Networking](https://blog.opto22.com/optoblog/topic/networking), [IIoT](https://blog.opto22.com/optoblog/topic/iiot) ## [Open-loop vs. Closed-loop Process Control](https://blog.opto22.com/optoblog/open-loop-vs.-closed-loop-process-control) Posted by [Matt Newton](https://blog.opto22.com/optoblog/author/matt-newton) on Feb 7, 2017, 8:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/laundromat-928779.jpg)](https://blog.opto22.com/optoblog/open-loop-vs.-closed-loop-process-control) ## Process Control Process control systems are used in everything from advanced manufacturing to run-of-the-mill activities at home, like heating your house and brewing your beer. (You do brew your own beer, don't you?) A control system that manufactures a product requires monitoring and control of many different process variables, while some at home require little more than a timer. For example, in manufacturing we may use flow meters to make sure fluids flow through pipes at a certain rate, or float meters to ensure ingredients fill a vat to a specified level. When I brew beer at home, I may use a temperature sensor in my mash tun, wired to a controller that’s controlling my heating element to keep the mash tun at just the right temperature for optimum starch-to-sugar conversion. This is an example of a closed-loop control system. (To see how small closed-loop control principles are scaled up to build industrial process control applications, check out the [New Belgium Brewery case study](https://info.opto22.com/new-belgium-brewing-case-study) and see how they use Opto 22 gear to brew their world-famous Fat Tire and other beers.) [Read More](https://blog.opto22.com/optoblog/open-loop-vs.-closed-loop-process-control) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/open-loop-vs.-closed-loop-process-control#comments-listing) Topics: [Food & beverage](https://blog.opto22.com/optoblog/topic/food-amp-beverage), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [Tips](https://blog.opto22.com/optoblog/topic/tips), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [Oil & gas](https://blog.opto22.com/optoblog/topic/oil-gas) ## [OptoNews: New blog posts on security in automation](https://blog.opto22.com/optoblog/optonews-new-blog-posts-on-security-in-automation) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Jan 18, 2017, 3:21:12 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/social-suggested-images/RTEmagicC_CTL1608_WEB_Cybersecurity-Opto22-Newton_CyberSecurity_locknkey.jpg-1.jpg)](https://blog.opto22.com/optoblog/optonews-new-blog-posts-on-security-in-automation) You never feel like you know enough about security. And security issues and recommendations are constantly changing, as the bad guys try to hack in and the good guys try to keep them out.  Here are a couple of new blog posts on this important subject, both by Opto 22's Matt Newton, who has years of experience in both automation and IT (information technology).  [Read More](https://blog.opto22.com/optoblog/optonews-new-blog-posts-on-security-in-automation) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-new-blog-posts-on-security-in-automation#comments-listing) Topics: [Internet of Things](https://blog.opto22.com/optoblog/topic/internet-of-things), [PLCs](https://blog.opto22.com/optoblog/topic/plcs), [IoT](https://blog.opto22.com/optoblog/topic/iot), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [Security](https://blog.opto22.com/optoblog/topic/security), [IIoT](https://blog.opto22.com/optoblog/topic/iiot), [Industrial Internet of Things](https://blog.opto22.com/optoblog/topic/industrial-internet-of-things), [OptoNews 2017-01-18](https://blog.opto22.com/optoblog/topic/optonews-2017-01-18) [All posts](https://blog.opto22.com/optoblog/all) [Next](https://blog.opto22.com/optoblog/topic/plcs/page/2) ### Subscribe to Email Updates ### Recent Posts ### Posts by Topic - 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