Opto 22

43044 Business Park Drive, Temecula, CA 92590 USA
Local & outside the USA:(951) 695-3000
Toll-Free within the USA:(800) 321-6786
Fax: (951) 695-3095
Email: sales@opto22.com

Change the Way You Think about HMIs. Forever.

groov. Now you can.

Have you seen this image on the Opto 22 homepage and wondered what it's all about?

It's all about groov, a new product from Opto 22 for building and deploying operator interfaces in ways you just couldn't till now.

We've had so much fun building and testing groov that we bet you'll say, "That's cool!" when you see it.

Groov is coming 3-13-13. Be the first to find out more: subscribe to updates now at groov.com.

New White Paper: Building an HMI that Works

White paper: Building an HMI that Works: New Best Practices for Operator Interface Design

Speaking of HMIs, our new white paper takes a look at the industry's new best practices for building an effective one.

You'll find out what's wrong with most HMIs and why, see some of the research behind those that work, and learn specific ways to make yours better.

Whether you're starting an HMI from scratch or thinking about adding to or changing yours, the information in this paper will help you build an HMI that increases productivity, saves downtime, and avoids accidents.

And by the way, these principles are part of what makes groov so cool.

Read the high-performance HMI white paper.

Estudiantes en Venezuela Aprenden Acerca de los Productos de Opto 22 

Venezuelan engineering students meet Opto 22 SNAP PACs and I/O

Este mes en Maracay, Venezuela, más de 20 estudiantes de ingeniería disfrutaron una formación práctica con los controladores y I/O de SNAP PAC de Opto 22. 

Todos los estudiantes que participaron estudian ingeniería electrónica en las Instalaciones de la UNEFA (Universidad Nacional Experimental de la Fuerza Armada) y están en su 7° u 8° semestre de sus estudios. 

El Ing. Germinal Puigbertrand de Optomize, Inc., distribuidor de Opto 22, enseño el curso de 20 horas. El curso fue coordinado por la Ing. Soraya Contreras, profesora para la cátedra Seminario de Control. 

Tech Tip: Working with Self-powered and Loop-powered Sensors

SNAP-AIMA-iSRC analog input module provides loop power

Quick, suppose you need to monitor sensors with a milliamp current signal. Should you get a SNAP-AIMA, a SNAP-AIMA-i, or a SNAP-AIMA-iSRC analog input module? Or what about a SNAP-AIMA-4 or a SNAP-AIMA-32?

All of these modules provide -20 mA to +20 mA analog current input connections. So which one do you need?

The first step is to determine whether you're monitoring self-powered or loop-powered sensors. Here's a simple definition of both, courtesy of Senior OptoForum Member gmitchell. (Thanks, George!)

  • Self-powered—An instrument that uses an internal power supply to provide 24 VDC loop power. Often found when the instrument requires higher power or additional electronics. Instantly recognizable, as it needs 4 wires (two for the power supply and two for the 4-20 mA signal).
  • Loop-powered—An instrument that requires an external 24 VDC loop power supply. Instantly recognizable, as it only requires two wires (to connect to the current loop).

The key to choosing your SNAP input module is the "SRC" at the end of the module's part number: a SNAP-AIMA-iSRC module provides (sources) 24 VDC loop power for the sensors connected to it. (It also has both channels and their power sources isolated from each other.)

So if your sensors are loop powered, you need to provide power for them through an external power supply like the SNAP-PS24 or SNAP-PS24U. If you wire this external power supply to the SNAP-AIMA-iSRC module, rather than directly to the sensors, the module provides isolated power to each loop. That isolated power eliminates ground loops. In addition, the SNAP-AIMA-iSRC limits current to protect itself and other devices on the loop.

If your sensors are self powered, choose one of our other current input modules, based on how many inputs you need and whether you need channel-to-channel isolation:

If you need Factory Mutual approval, some of these current input modules have FM-approved versions. Just look for part numbers with -FM at the end.

One other thing: never mix loop-powered and self-powered sensors on one input module unless it has channel-to-channel isolation.

A question in our OptoForums prompted this tech tip. Get your questions answered—and contribute answers to other folks' questions—in the Forums. Hardware, software, integration with other systems: it's all there. All you need to post is a free, easy-to-get My.Opto account.

Ask or answer questions in the OptoForums.
Get a My.Opto22 account.

Questions? Comments? Contact Opto 22 Product Support.


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Opto 22 Product Support is FREE Monday through Friday 7 a.m. to 5 p.m. Pacific Time

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