Category Archive: Standards

Aug
13

Emerson Exchange – Meet the Expert Session

This year Emerson Exchange will be held October 8-12, 2012 – Hilton Anaheim in Anaheim, California.  A number of meet the expert sessions are scheduled for the last day of the conference, Friday, October 12th . Willy Worjsznis and I will host one meet the expert session in which we will give an overview of …

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Aug
06

Advanced Control Foundation – Coming Soon

Many of the advanced control products available in the DeltaV control system can be traced to an advanced control research and development program established within Emerson Process Management in the early 1990s. The ISA book Advanced Control Unleashed – Plant Performance Management for Optimum Benefit, published in 2003, included examples based on advanced control software …

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Jul
30

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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Jul
23

Permitted and Actual Mode

The input parameters of are function block are used by the algorithm in conjunction with the state of the function block application to determine if the algorithm can achieve the target mode of operation established for it. The target mode attribute as origianlly defined by ISA50 is the part of the mode parameter that indicates …

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Jul
16

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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Jul
09

Mode – Bumpless Transfer

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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Jul
02

Mode – The Role 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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Jun
25

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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Jun
18

Impact of ISA106 on Process Automation

One of the side discussions at the SC65E WG7 meeting in Meisdorf, Germany, May, 2012 was the work by ISA106 and its potential impact on process automation. The formation of the ISA106 committee was first announced by ISA in May, 2010. Since that time this committee has been very active. The purpose of this committe …

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Jun
11

Field Device Integration (FDI) Standard – IEC62769

The SC65E WG7 committee met May 28-June1, 2012 in Meisdorf, Germany. In this meeting the committee addressed work that is part of the maintenance cycle for IEC61804 – Function blocks (FB) for process control. Also, much of the meeting discussion focused on work related to the development of IEC 62769 Field device integration (FDI) standard. …

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