--- title: "OptoNews: G4 I/O - Going strong since 1989" description: Use reliable G4 I/O with SNAP PAC controllers and PAC Project software by replacing the legacy brain. image: https://blog.opto22.com/hubfs/Products/G4D32EB2_464x264.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) - 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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? There's no reason you should. You can still buy G4 digital I/O and get free support plus a lifetime warranty on most modules. You can be sure we've tested each individual module twice under full load before it's shipped to you. They're seriously reliable and used all over the world. And **you're no longer limited to serial-networked** *mistic* systems with your G4D32RS digital I/O units. You can use them in a modern Ethernet-networked SNAP PAC System. That means you can: - Upgrade your G4D32RS *mistic* bricks to the latest powerful SNAP PAC programmable automation controllers and PAC Project software, without replacing field wiring. - If you already have a SNAP PAC System, connect these G4 I/O units to it. - Switch digital loads up to 3 Amps at 45 ºC with G4 output modules (check individual module specs for variation). **To change existing G4 digital I/O units**—Part number [G4D32EB2-UPG](http://www.opto22.com/site/pr_details.aspx?cid=4&item=G4D32EB2-UPG) includes a new Ethernet-based brain and a new cover. You can replace the legacy G4D32RS brain and cover currently on your digital I/O unit while keeping the G4 I/O and field wiring in place.  [![G4 I/O with an Ethernet-based G4D32EB2 brain](https://blog.opto22.com/hs-fs/hubfs/Products/G4D32EB2_464x264.png?width=280&height=159&name=G4D32EB2_464x264.png "G4 I/O with an Ethernet-based G4D32EB2 brain")](http://www.opto22.com/site/pr_details.aspx?cid=4&item=G4D32EB2-UPG) Remember that the new brain uses a different protocol—OptoMMP instead of *mistic*—and different commands. So for an existing I/O unit, you will need to change your program in order to communicate.  **To add new G4 digital I/O units**—Part number [G4D32EB2](http://www.opto22.com/site/pr_details.aspx?cid=4&item=G4D32EB2) includes the brain, cover, and rack. For a new I/O unit, add the G4 modules you need at that location.  **Both upgraded and new** G4 digital I/O units are natively supported in PAC Control; just choose the brain in the list to configure the I/O unit. [![See the Ethernet G4 brain](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/439485/bdc01e98-204d-4aa7-b3c5-2dc5a8caa4ae.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/439485/bdc01e98-204d-4aa7-b3c5-2dc5a8caa4ae) 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) ### 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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