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

Hot Tips from Product Support: Background Strategy Downloading

Focus on: SNAP TEX Mechanical Relay Breakout Boards

SNAP PAC System: Clase en Español

New OptoMinute Video Introduces Temperature Inputs

Hot Tips from PSG: Background Strategy Downloading

PAC Control

Opto 22's Product Support Group (PSG) develops some helpful tips as they work with customers who contact them for free product support.

In this tip, PSG engineers show you a better way to update PAC Control strategies on systems that can’t tolerate downtime.

Background Strategy Downloading, included in PAC Control 8.1 or higher, lets you download a new strategy while a current strategy continues to run.

Not only can you switch to the new strategy much faster (especially with large strategies), but you can also switch back if needed.

Background downloading works by splitting the controller’s memory in half. The strategy that’s running is in the active half. While you download a new strategy to the background (alternate) half, SCADA and HMI access programs continue to retrieve data from the active half.

Here are some things to keep in mind when you use background strategy downloading:

  • Background downloading isn't automatic; you need to turn it on in PAC Manager and PAC Control.
  • One task is taken up by background downloading, so you'll have one fewer task to use in your strategy.
  • Having just half the memory for one strategy should not be a problem unless your strategy is extremely large.
  • Both strategies can be saved to flash memory, since flash is also split in half.
  • You may see a very slight degradation in performance while downloading.
  • When you switch strategies, persistent variables are compared. If a variable's type and size match, its value is copied to the new strategy. If not, a new persistent variable is created and initialized to zero.
  • I/O unit configurations are also compared. If they match, I/O is not initialized when the strategy is switched.
  • The new strategy starts running at the Powerup chart, not in mid-logic.

Full details are in the PAC Control User's Guide. Just check the index for "background downloading." If you still have questions, contact Product Support.

Focus on: SNAP TEX Mechanical Relay Breakout Boards

SNAP TEX cablesSNAP I/O digital output modules can switch up to 0.75 amps per point. But what if you need to switch a larger load?

Our new SNAP TEX mechanical relay breakout boards were built just for that purpose.

With one relay per point, the MR boards are designed for high-current switching—up to 10 amps per point.

  • Check out the SNAP-TEX-MR10-4 breakout board, with four points to accommodate one SNAP 4-channel digital output module.
  • Or take a look at the SNAP-TEX-MR10-16, with 16 points, for four 4-channel modules or one 16-channel high-density digital module.

SNAP PAC System: Clase en Español


En septiembre, ofreceremos de nuevo nuestro curso gratis de entrenamiento práctico de Sistemas SNAP PAC en español.

La clase incluye almuerzos, una visita a la fábrica de Opto 22, y la oportunidad de conocer a los empleados de Opto 22, además de cuatro días de entrenamiento con un instructor.

Para inscribirse en la clase, por favor vea el horario de clases en nuestro sitio web.

Our popular hands-on SNAP PAC System training class will be given in Spanish this September. These free, four-day, instructor-led classes are usually offered in English. For more information or to register, see the Training section on our website.

Clase en Español: 15-18 de Septiembre, 2008
Ubicación: Opto 22 oficina principal, Temécula, CA
Para más informacíón, avísenos a: training@opto22.com

New OptoMinute Video Introduces Temperature Inputs

Temperature Inputs OptoMinute Video

If you'd like to know more about temperature sensors and how to use them with SNAP I/O, take a look at our new OptoMinute video.

In just 60 seconds, Engineer Alexi Beck Gray introduces the three main types of temperature sensors: thermocouples, ICTDs, and RTDs. She also shows you which kinds of SNAP analog I/O modules work with each.

Watch the Temperature Sensors video
Read the white paper for more details: I/O Solutions for Temperature Monitoring


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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