Category Archive: Fieldbus


Control Classes – Dubai

Emerson Employees that Attended the Dubai Training Class

In late November, 2014 I traveled to Dubai to teach the Control Loop Foundation class. This class is based on the book Control Loop Foundation – Batch and Continuous Processes and is a standard class offered by Emerson’s education department. In this class the students used the book’s web site to perform the workshops that …

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TC65 Plenary Meeting

SC65E Meeting Hamburg Germany

Many of the international standards that we depend on in the process industry were created by working groups within IEC TC65: Industrial-process measurement, control and automation. IEC TC65 holds a plenary meeting every two years to review the status of work to develop or update international standards. The most recent plenary meeting was held March …

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ISA104 Meeting at ISA Automation Week

Field Device Integration (FDI)

The ISA104 standard committee, Device Integration, met on Monday, November 4th, in conjunction with ISA Automation Week in Nashville, TN. The ISA104 committee consists of 30 people from the USA, Singapore, Japan, France, Germany, UK, China, Canada, and Columbia that have varied backgrounds in industry and universities. Committee members that could not travel to Nashville …

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Foundation Book Promotional Kit

Foundaton Book Display

The single loop and multi-loop control techniques most often used in automating continuous and batch processes are addressed in the book Control Loop Foundation – Batch and Continuous Processes. Similarly, the advanced control techniques that are most often utilized in the process industry are addressed in the book Advanced Control Foundation – Tools, Techniques, and …

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IEC/ISA Meeting During ISA Automation Week

IEC accepted the U.S. National Committee’s offer to hold IEC/TC 65, SC 65A, SC 65B, SC 65C and SC 65E meetings during the weeks of 17-21 and 24-28 September 2012 at the Orange County Convention Center, Orlando Florida, USA. Subcommittee meetings are schedules the week before the start of ISA Automation Week. The plenary will …

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Boot Camp for New Employees


Courses required for an engineering degree are designed to provide the student with a sound technical foundation for work in industry. However, in most cases these courses do not address the terminology and common practices that an engineer must know to design, implement, checkout and commission a process control system. Universities can help bridge this …

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Mode Structure


The PID block mode parameter as originally defined by ISA50 determines the source of the block setpoint and the source of its output. This mode parameter is structure to contain four attributes: Target – The mode of operation requested by the operator Actual – The mode of operation that may be achieved based on the …

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Mode – Bumpless Transfer

Block Calculation Sequence

As an operator changes the mode of a function block, it is important that this change not cause a sudden change in plant operation. In the ISA50 mode implementation, the status in the backward path plays an important role in providing bumpless transfer. For example, the actual mode of an analog output block will not transfer …

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Mode – The Role of Status

Propagation of Status

As the ISA50 function block team considered how to improve plant operations through a more comprehensive implementation of mode in the control system, they realized it would be important that the control blocks, such as the PID, be designed to automatically take into account up-steam and downstream conditions that impact control operation. Thus, inputs and …

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Distributed Control Systems’ Implementation of Mode


To ease operator transition from panel-based systems to monitor-based systems, the manner in which first generation Distributed Control Systems (DCS) displayed information often mimicked the way this information had earlier appeared on the control panel. Since the control interface provided by the control panel was familiar and had proven to be effective, a similar presentation …

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