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

New Current Transformers (CTs) for Accurate Energy Monitoring

Highly accurate split-core CTs with 0.333 V secondary

If you need to monitor energy usage directly from equipment and electrical panels, you'll find these new split-core CTs easy to install and highly accurate.

We recommend them for use with SNAP-AIPM-3V power monitoring modules and the OptoEMU Sensor 3V energy monitoring unit.

Split core for easier installation on existing wiring, the CTs swing open so you can maneuver them with one gloved hand. The low 0.333 VAC output makes them safer to install, too.

Their exceptionally low phase angle error means they comply with the linearity and accuracy requirements of IEEE/ANSI C57.13, making them ideal for tenant submetering and billing. Made in the U.S.A. by Continental Control Systems, they're now available from Opto 22.

Three new CT models:

For a higher primary current, check out these:

Caso: Industria Química de Istmo

Caso: Industria Química de Istmo

Tenemos un nuevo caso de éxito en español sobre la empresa mexicana Industria Química de Istmo en Monterrey, N.L., México. La compañía es una empresa líder dedicada a la producción de productos químicos que sirven como base para productos de limpieza.

Esta empresa se ha visto obligada a rentar almacenes para sosa cáustica, uno de sus productos de más demanda en el mercado, y tenía la necesidad de automatizar el almacenamiento y suministro de materias primas basado en un sistema que cumpliera con la confiabilidad requerida y la opción de crecimiento en etapas. Esta confiabilidad y modularidad la encontraron en los equipos de automatización Opto 22.

Caso: Industria Química de Istmo

Get Ready to Go Green

Green leaves

Tired of throwing away unnecessary paper and keeping track of old CDs?
We are, too.

That's why we're removing most documentation from shipped Opto 22 products. Instead, you'll see a small paper with a link to get all the documents and downloads you need in one easy location on our website: docs.opto22.com

You'll always get the most current information for your product. You don't have to store it or file it; we keep it for you, so it's always there when you need it.

And if you do need a printed copy, just ask. Email us at docs@opto22.com and let us know what you need. We'll send it to you right away.

Thanks for helping Opto 22 go green.

Tech Tip: IVAL vs. XVAL

IVAL and XVAL in PAC Control automation software

If you use PAC Control or OptoControl 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.

Meet IVAL—IVAL is the Internal value of an I/O point, kept within the controller from the last time strategy logic accessed that point. The IVAL may or may not be current.

And XVAL—XVAL is the eXternal value, which is the "real" or hardware value of the I/O point on the I/O unit. This value is in the brain, not in the control engine or strategy logic.

The IVAL is updated only when logic in the controller reads or writes to the point, for example when the Move command is executed. So if an IVAL doesn't match an XVAL, the most likely cause is that the strategy logic doesn't access that point on a regular basis—which is usually fine. One of the advantages of flowcharting over ladder logic is that the controller accesses I/O points only when it needs to, rather than wasting resources with unnecessary communication.

Why have IVAL and XVAL? The main use for IVAL and XVAL is in simulation and testing. For example, you may want to test output performance by forcing the output's XVAL to a particular value. Or you may test program logic by forcing an input's IVAL to a value.

In order to test, you first disable the I/O point or I/O unit so the strategy cannot read or write to the point. You can disable an I/O point or unit in two main ways:

  • In Debug mode, double-click the point on the Strategy Tree and modify the point's settings and values through the inspection dialog box (shown above).
  • Within the strategy, use a Simulation command such as Disable Communication to Digital Point, Disable Communication to Analog Point, or Disable Communication to I/O Unit. When finished testing, use the related Enable command to re-enable the I/O point or unit.

You can also disable a point or I/O unit when you configure it—for example if you don't have hardware yet but are already programming your control strategy. When you've finished testing, you can go back into the configuration dialog box and enable it.

Questions? Comments? Contact Opto 22 Product Support.


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Opto 22 Product Support

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

Product Support Numbers:

Local: (951) 695-3080
Toll-Free: (800) 835-6786
Fax: (951) 695-3017