Have you seen this image on the Opto 22 homepage and wondered what it's all about?
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We've had so much fun building and testing groov that we bet you'll say, "That's cool!" when you see it.
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Speaking of HMIs, our new white paper takes a look at the industry's new best practices for building an effective one.
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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.
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.
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.
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Questions? Comments? Contact Opto 22 Product Support.