Archive of PLC - MAVERICK Rethinking Automation

The Benefits Of Reusing Control Logic

Posted by Matt Dougherty on February 19, 2013 @ 9:49 am

The first large project I worked on in my career taught me that reusing code isn’t just a way to get more done with less effort; it is also makes problems that have nothing to do with the code very obvious. Let me explain: The project was a new 40 million gallon-per-day wastewater treatment facility in South Carolina. The commissioning of the plant went very well, and all systems checked out. A few weeks after commissioning, I was sent back to the plant because they were having a problem with their effluent pumps. Three effluent pumps were set up in a lead-lag configu...

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MOC for Plant Control Systems

Posted by Jason Montroy on May 30, 2012 @ 7:52 am

Management of change (MOC) can apply to nearly anything from organizations to projects to IT infrastructure. But does it apply to plant control systems? Considering that control systems need to change over time - process optimization drives changes in control logic and software updates occur on at least a monthly basis – the answer is: MOC is essential for plant control systems. You will make at least a handful of changes to your control systems on a monthly basis. It pays to approach these changes in a consistent manner. After all, if your SCADA system fails, your operators find themselves flying blind, without a means to control the system. If your PLC or DCS fails, plant production will come to a screeching halt. Most plants have some form of MOC process. But not every plant’s process is well-reasoned and documented – or effective. Processes range from simply “asking Joe...

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