Digital output modules do the job of switching electrical loads. But which SNAP module do you need for your application?
Your choice depends on the load you need to switch, among other things. Here's a quick look to help you choose the right Opto 22 products for your load.
Mechanical relay modules. A simple solution for loads up to 6 amps is our SNAP-OMR6-C module, four electromechanical relays in a SNAP form factor. With channel-to-channel isolation, each channel can switch up to 6 A. Channels are not polarity sensitive, so they can switch either AC or DC power. Each point can be wired for normally open or normally closed.
4-channel solid-state modules. For small to moderate loads and many signal types, solid-state 4-channel SNAP digital output modules are your best bet. Each module can handle a maximum of 3 amps total for all four channels, spread among the four in any way you want.
Solid-state SNAP modules are guaranteed for life, because they have no mechnical parts to wear out and we've tested every one. Some modules offer options for channel-to-channel isolation and Factory Mutual approval. Choose sinking or sourcing (if you aren't sure, see the animated demo on sinking and sourcing or the short sinking/sourcing video).
High-density solid-state modules. Need more than 4 channels on one SNAP solid-state module? Our high-density digital output modules have 32 channels. But maximum loads are small for each channel: just 0.25 A.
Mechanical relay boards. To boost maximum loads way up for both 4-channel and high-density solid-state modules, add a SNAP TEX mechanical relay breakout board. These boards incorporate a 10 A mechanical relay for each point on the module. Each point can handle up to 10 amps, and each point can be wired for either normally open or normally closed. The boards also include channel-specific LEDs.
Before buying, check the Modules, Cables, and Breakout Boards Compatibility Chart to make sure everything works together.
Reed relay modules. Finally, if you're switching extremely light loads you might consider our reed relay modules, like the SNAP-ODC5R. Reed relay modules are designed for a very low-voltage DC load (maximum 0.5 A) that's purely resistive (no inrush current). They'll weld shut if your load is inductive, capacitive, AC, or even slightly over the limit. If you're thinking about reed relays, you may want to check with a Pre-Sales engineer to make sure they're right for your application.
Questions? Contact your local Opto 22 distributor (U.S./Canada or International) or a Pre-Sales engineer:
Phone: 800-321-6786 or 951-695-3000
Our hands-on SNAP PAC System training classes at our company headquarters in Temecula, California, are always popular.
Now there's even one more reason to attend one of these free, instructor-led, three-day classes: we've added training on groov.
groov is the easy-to-use tool for creating and viewing mobile operator interfaces for your automation system. groov makes it easy to build an interface that works on virtually any smartphone or tablet, as well as on PCs and even web-enabled HDTVs.
In class you'll learn how groov fits with the SNAP PAC System and gives you the ability to monitor and control other automation systems as well.
- You'll learn to build a simple operator interface just by dragging and dropping pre-built gadgets onto the screen, and then tagging them from your existing tag server—either from PAC Control or from an OPC-UA server.
- You'll see how your interface looks on a desktop or tablet and how it looks on a handheld phone, and you'll learn what tweaks to make to maximize both views.
- Then you'll use the interface you built on your class computer and on your own mobile device.
Ready to learn? Find out more about SNAP PAC System and groov Training.
If you're interested in energy and electrical distribution, you won't want to miss the 2014 Electrical Expo, March 25-26, in St. Charles, Missouri.
This expo is held only every three years and presented by the Electrical Board of Missouri and Illinois. The expo includes seminars on a variety of topics, including the latest updates to the National Electrical Code (PDH/LU/PEU continuing education credits available).
In addition, over 200 booths will display the latest products and services for you to see.
Be sure to visit Opto 22's booth and talk with our knowledgeable Regional Sales Manager, Dave Engsberg. Dave will demonstrate the SNAP PAC System and groov and answer your questions.
You'll see how groov makes it easy to build secure mobile operator interfaces for just about any automation system, so you can monitor and control what you need to from virtually any brand smartphone or tablet.
What: 2014 Electrical Expo
When: March 25-26, 2014
Where: St. Charles Convention Center, St. Charles, Missouri
This week's PAC Control 101 lesson ventures into an unusually well-controlled forest in search of pointer examples.
Opto 22 Director of Training Mary St. John explains in this OptoForum post about pointers. Pointers are a special type of data that can be stored in a PAC Control variable. Instead of storing the value of the variable, a pointer stores the memory address of a variable or of some other PAC Control item like a chart, an I/O point, or a PID loop.
You can perform any operation on the pointer that you could perform on the object the pointer points to.
Pointers are an advanced programming tool and can be tricky, but they're also powerful and flexible and can save you a lot of time. Mary's example makes that clear.
Read PAC Control 101: Pointers in the OptoForum.