--- title: OptoBlog | PAC Project (4) description: PAC Project | (4) --- - [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)   # OptoBlog # OptoBlog ## [OptoNews Tip: PAC Control shortcuts save you time](https://blog.opto22.com/optoblog/optonews-tip-pac-control-shortcuts-save-you-time) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Mar 2, 2016, 4:15:33 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/clock_224x149.png)](https://blog.opto22.com/optoblog/optonews-tip-pac-control-shortcuts-save-you-time) If you're someone who likes to save time, you probably already know about keyboard shortcuts like CTRL+S to save or CTRL+F to find. But do you know about the shortcuts in PAC Control? Here are a few that can speed your programming. [Read More](https://blog.opto22.com/optoblog/optonews-tip-pac-control-shortcuts-save-you-time) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-pac-control-shortcuts-save-you-time#comments-listing) Topics: [Tips](https://blog.opto22.com/optoblog/topic/tips), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2016-03-02](https://blog.opto22.com/optoblog/topic/optonews-2016-03-02) ## [OptoNews: New video - Diving deep with James Cameron](https://blog.opto22.com/optoblog/optonews-video-diving-deep-with-james-cameron) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Feb 17, 2016, 4:04:32 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/dsc_video_280x158.png)](https://blog.opto22.com/optoblog/optonews-video-diving-deep-with-james-cameron) In 2012, explorer and filmmaker James Cameron did what no one had ever done before.  He piloted a one-man submersible to Challenger Deep at the bottom of the Mariana Trench, the lowest spot on earth, 6.8 miles (10.9 km) below sea level. [Read More](https://blog.opto22.com/optoblog/optonews-video-diving-deep-with-james-cameron) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-video-diving-deep-with-james-cameron#comments-listing) Topics: [Videos](https://blog.opto22.com/optoblog/topic/videos), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [Deepsea Challenge](https://blog.opto22.com/optoblog/topic/deepsea-challenge), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2016-02-17](https://blog.opto22.com/optoblog/topic/optonews-2016-02-17) ## [OptoNews Tip: IVAL and XVAL](https://blog.opto22.com/optoblog/optonews-tip-ival-and-xval) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Feb 3, 2016, 4:13:28 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/ival_xval_db_260x252.png)](https://blog.opto22.com/optoblog/optonews-tip-ival-and-xval) If you use PAC Control to develop your control programs, here's a question you may have: What the heck are IVAL and XVAL? You see these terms in Simulation commands such as IVAL Set Analog Point, and you also see them when you inspect I/O points in Debug mode. [Read More](https://blog.opto22.com/optoblog/optonews-tip-ival-and-xval) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-ival-and-xval#comments-listing) Topics: [Tips](https://blog.opto22.com/optoblog/topic/tips), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2016-02-03](https://blog.opto22.com/optoblog/topic/optonews-2016-02-03) ## [OptoNews: Top 5 blog posts for 2015: security, PIDs, and more](https://blog.opto22.com/optoblog/optonews-top-5-blog-posts-for-2015) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Jan 6, 2016, 4:45:03 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/social-suggested-images/sinking_sourcing_demo_356x347.png)](https://blog.opto22.com/optoblog/optonews-top-5-blog-posts-for-2015) Did you miss any of these? Here are the 5 OptoBlog posts our readers found most interesting in 2015: ## 1. Sinking and Sourcing in DC Circuits [Read More](https://blog.opto22.com/optoblog/optonews-top-5-blog-posts-for-2015) 1 Comment [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-top-5-blog-posts-for-2015#comments-listing) Topics: [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Internet of Things](https://blog.opto22.com/optoblog/topic/internet-of-things), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2016-01-06](https://blog.opto22.com/optoblog/topic/optonews-2016-01-06) ## [OptoNews tip: Getting weekly, monthly, yearly totals](https://blog.opto22.com/optoblog/optonews-tip-getting-weekly-monthly-yearly-totals) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Jan 6, 2016, 4:44:14 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/Products/groov-pump-run-cost_320x166.png)](https://blog.opto22.com/optoblog/optonews-tip-getting-weekly-monthly-yearly-totals) We've talked recently about digital and analog totalizing: getting total running values for on-time, flow, power production, and so on.  The next step is using those totals in your PAC Control strategy—and in your *groov* mobile operator interface—to get the information you need. [Read More](https://blog.opto22.com/optoblog/optonews-tip-getting-weekly-monthly-yearly-totals) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-getting-weekly-monthly-yearly-totals#comments-listing) Topics: [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), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2016-01-06](https://blog.opto22.com/optoblog/topic/optonews-2016-01-06) ## [OptoNews Tip: Analog totalizing—without the calculus](https://blog.opto22.com/optoblog/optonews-tip-analog-totalizing-without-the-calculus) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Dec 2, 2015, 4:23:54 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/solar_power_309x253.png)](https://blog.opto22.com/optoblog/optonews-tip-analog-totalizing-without-the-calculus) Suppose you have an analog input—maybe it's a flow meter, for example—and you want to know not only the current flow rate, but also the cumulative flow over time. How many gallons went through that pipe over the last 24 hours, or over the last month?  If you're using an Opto 22 analog input module and PAC Control, you're in luck.  [Read More](https://blog.opto22.com/optoblog/optonews-tip-analog-totalizing-without-the-calculus) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-analog-totalizing-without-the-calculus#comments-listing) Topics: [Energy management](https://blog.opto22.com/optoblog/topic/energy-management), [Process control](https://blog.opto22.com/optoblog/topic/process-control), [Tips](https://blog.opto22.com/optoblog/topic/tips), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2015-12-02](https://blog.opto22.com/optoblog/topic/optonews-2015-12-02) ## [OptoNews tip: PAC Control Communication Handles](https://blog.opto22.com/optoblog/optonews-tip-pac-control-communication-handles) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Nov 18, 2015, 5:24:29 PM - [Tweet](https://twitter.com/share) [![](http://www.opto22.com/images/optonews/handles_224x149.png)](https://blog.opto22.com/optoblog/optonews-tip-pac-control-communication-handles) Do you use [communication handles](http://www.opto22.com/community/showthread.php?t=673) in your PAC Control strategy? Or are you thinking, "What's a communication handle?" In either case, this tip is for you. A communication handle is a powerful type of variable in PAC Control. You'll use it for three main reasons: [Read More](https://blog.opto22.com/optoblog/optonews-tip-pac-control-communication-handles) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-pac-control-communication-handles#comments-listing) Topics: [Tips](https://blog.opto22.com/optoblog/topic/tips), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2015-11-18](https://blog.opto22.com/optoblog/topic/optonews-2015-11-18) ## [OptoNews: G4 I/O - Going strong since 1989](https://blog.opto22.com/optoblog/optonews-g4-io-since-1989) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Nov 4, 2015, 4:57:08 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/Products/G4D32EB2_464x264.png)](https://blog.opto22.com/optoblog/optonews-g4-io-since-1989) If you've used Opto 22 products for a long time, you may very well have some colorful [G4 digital I/O modules](https://www.opto22.com/products/product-selector?keyword=&c1=26&c2=28&tag=1380,1343) in a panel somewhere. They were probably installed back in the 1990s. Still reliably monitoring sensors and activating outputs, these G4s are likely the workhorses of your automation system. Why would you ever want to replace them? [Read More](https://blog.opto22.com/optoblog/optonews-g4-io-since-1989) 1 Comment [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-g4-io-since-1989#comments-listing) Topics: [Discrete control](https://blog.opto22.com/optoblog/topic/discrete-control), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [Migration](https://blog.opto22.com/optoblog/topic/migration), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [Optomux](https://blog.opto22.com/optoblog/topic/optomux), [OptoNews 2015-11-04](https://blog.opto22.com/optoblog/topic/optonews-2015-11-04) ## [OptoNews: Choose components for your control system](https://blog.opto22.com/optoblog/optonews-choose-components-for-your-control-system) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Nov 4, 2015, 4:56:15 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/sps_components_demo_464x350.png)](https://blog.opto22.com/optoblog/optonews-choose-components-for-your-control-system) Choose the software, controllers, I/O, and more for your application, with help from our new interactive demo about SNAP PAC System components. You'll find answers to questions like these: [Read More](https://blog.opto22.com/optoblog/optonews-choose-components-for-your-control-system) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-choose-components-for-your-control-system#comments-listing) Topics: [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2015-11-04](https://blog.opto22.com/optoblog/topic/optonews-2015-11-04) ## [OptoNews tip: Totalizer helps you choose which pump to run](https://blog.opto22.com/optoblog/optonews-tip-totalizer-choose-which-pump-to-run) Posted by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) on Oct 21, 2015, 5:17:45 PM - [Tweet](https://twitter.com/share) [![](https://blog.opto22.com/hubfs/OptoNews/4_blue_pumps_464x309.png)](https://blog.opto22.com/optoblog/optonews-tip-totalizer-choose-which-pump-to-run) Let's say you have four pumps available, and you don't run them all at once. When it's time to start one, you want to choose the one with the least wear.  You can decide which one to start by comparing the total amount of time each pump has run. That's a job for a totalizer. [Read More](https://blog.opto22.com/optoblog/optonews-tip-totalizer-choose-which-pump-to-run) 0 Comments [Click here to read/write comments](https://blog.opto22.com/optoblog/optonews-tip-totalizer-choose-which-pump-to-run#comments-listing) Topics: [Tips](https://blog.opto22.com/optoblog/topic/tips), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [PACs](https://blog.opto22.com/optoblog/topic/pacs), [I/O](https://blog.opto22.com/optoblog/topic/io), [PAC Project](https://blog.opto22.com/optoblog/topic/pac-project), [OptoNews 2015-10-21](https://blog.opto22.com/optoblog/topic/optonews-2015-10-21) [Previous](https://blog.opto22.com/optoblog/topic/pac-project/page/3) [All posts](https://blog.opto22.com/optoblog/all) [Next](https://blog.opto22.com/optoblog/topic/pac-project/page/5) ### Subscribe to Email Updates ### Recent Posts ### Posts by Topic - [groov EPIC (514)](https://blog.opto22.com/optoblog/topic/groov-epic) - [groov RIO (307)](https://blog.opto22.com/optoblog/topic/groov-rio) - 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