Fig. 1. Input vector for TITO process.

Guidelines for the tuning and the evaluation of decentralized and decoupling controllers for processes with recirculation

Abstract: This paper gives guidelines for the pairing, the time response specification, and the tuning for processes with recirculation when decentralized controllers are used. This selection is based on the condition number, which is an indicator of the process directionality, and on the generalized dynamic relative gain (GDRG), which is a measure of the interaction. […]

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Auto-Tuning Takes Too Long – Now What?

In the ISA Automation Week Mentor Program I am providing guidance for extremely talented individuals from Argentina, Brazil, Malaysia, Mexico, Saudi Arabia, and the USA. We will be sharing a question and the answers each week. If you would like to provide additional answers, please send them to Susan Colwell at ISA. This question is […]

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Security standards committee completes ballot

The ISA99 committee recently completed a ballot on the standard, ISA-62443.03.03 (99.03.03), Security for Industrial Automation and Control Systems: System Security Requirements and Security Assurance Levels. Closing on October 27, 2011, the ballot passed with 18 approval votes and five disapproval votes. Reflecting the widespread interest in the draft, more than 500 comments were received […]

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Function Block

IEC 6-1131-3

The IEC (International Electrotechnical Commission) 6-1131-3 Standard is a widely recognized international standard for the programming of a PLC. How many ‘Graphical languages’ are there in the IEC  6-1131-3  ? a.  2 b.  3 c.  4 d.  5 The correct answer is A. They are Ladder Diagram (LD) and  Function Block Diagram (FBD). Ladder Diagram […]

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TUNE YOUR LOOP: Using RFID/RTLS to Track Industrial Assets

TUNE YOUR LOOP: Using RFID/RTLS to Track Industrial Assets

1. Identify which frequency band is being used in many wireless network systems. 2. Which RFID frequency results in the shortest tag antenna length? 3. Which technology provides the highest data rate (but at a short distance)? 4. For reliable and accurate spatial determination, how many GPS satellites should the handheld unit have “visibility” to? […]

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Fig. 1. Block diagram of a typical PID control system.

How Do You Know When Feedforward Is Needed?

In the ISA Automation Week Mentor Program I am providing guidance for extremely talented individuals from Argentina, Brazil, Malaysia, Mexico, Saudi Arabia, and the USA. We will be sharing a question and the answers each week. If you would like to provide additional answers, please send them to Susan Colwell at ISA. The third question […]

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smart-grid

Is Smart Grid Avoiding Real Challenges?

In my opinion, there is too much hype about the Smart Grid without looking at the core problems from an engineering and business point of view. There is a constant flow of information, presentations, and discussions about the Smart Grid, but I wonder if this simply makes people feel good and avoids facing the real […]

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