Programmable electronic system PES

This is a system for control, protection, or monitoring based on one or more programmable electronic devices, including all elements of the system, such as power supplies, sensors, and other input devices, data hi ways and other communication paths, and actuators and other input devices. 

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Software In some programmable electronic systems (PES), errors are much easier to detect and correct than in others. Using the term software, in the wider sense, to cover all procedures, as distinct from hardware or equipment, some software is much friendlier than others. Training and instructions are obvious examples. As another example, if many types of gaskets or nuts and bolts are stocked, sooner or later the wrong type will be installed. It is better, and cheaper in the long run, to keep the number of types stocked to a minimum, even though more expensive types than are strictly necessaiy are used for some applications. 

Programmable Electronic System (PES) A system based on a computer connected to sensors and/or actuators in a plant for the purpose of control. 

The use of computers and microprocessors (also known as programmable electronic systems [PES]) in process control continues to grow. They have brought about many improvements but have also been responsible for some failures. If we can learn from these failures, we may be able to prevent them from happening again. A number of them are therefore described below. Although PES is the most precise descnption of the equipment used, I refer to it as a computer, as this is the term usually used by the nonexpert. 

Fast forward a decade and a half to 1998 and echoes of the Markham report resonate in the standard EN 61508. This standard, called Functional safety ofelectrical/electronic/program-mable electronic safety-related systems, was developed in response to an increasing number of industrial accidents whose cause was attributed to Programmable Electronic Systems (PES). The increasing trend was to use the PES to perform the safety and plant control functions, and move away from mechanical or hardwired electrical controls. While the estabhshed method... 

Figure 6 - Programmable electronic system (PES) structure and terminology...

Is there an acceptable user/operator manual for Programmable Electronic Systems (PES) ... 

ANSI/ISA-84.00.01-2004-1 provides extensively detailed requirements for application software in Part 1, Clause 12, Requirements for application software, including selection criteria for utility software." In comparison, ANSI/ISA-84.01-1996 provided less definitive requirements for application software in Clause 7.8.3, Application logic for Programmable Electronic Systems (PES). ... 

Since 2.5 x 10 is greater than 10 , a design modification is proposed whereby a programmable electronic system (PES) closes a valve in each stream, based on an independent measme of the downstream pressme. The valves consist of actuated ball valves (sprung to close). This is illustrated at the bottom of Figme 11.1. 

The aim of this paper Is to outline a method of using off the shelf programmable electronic systems (PES) In a failsafe redundant configuration with which It Is hoped to achieve the safety and availability requirements for a refuelling control system. 

The susceptibility of programmable electronic systems (PES) to electromagnetic Interferences (EMI) Is known as an actual problem from the point of view of PES safety. At first, some specific aspects are focused oni f l those relevant to the programmable electronics of PESs. 

Schematical structure of a Programmable Electronic System (PES) (by courtesy of R. BELL, Health and Safety Executive, UK).

IMPROVING THE SAFETY LEVEL OF PROGRAMMABLE ELECTRONIC SYSTEMS (PES) BY APPLYING THE CONCEPT OF SIGNATURE ANALYSIS... 

In accepting Input from EWICS TC7, standards bodies have access to well developed and supported guidelines that have generic application to many Industries and uses of programmable electronic systems (PES). Another shade of meaning for harmony. 

The use of programmable electronic systems (PES) in industry has grown considerably with the availability of microcomputers. These systems offer many benefits to the designer and user in providing more comprehensive control of industrial processes, enviroments, machine tools and in robot installations. As confidence grows with the application of PES, users and manufacturers are considering incorporating safety functions within the requirements and functions of the PES. 

See Programmable Electronic System (PES) for additional related information. 

Programmable Electronic System (PES) - A microprocessor based system consisting of Programmable Electronic Controllers, Sensors, Final Control Elements, man-machine interfaces, historians, printers, etc., connected by a data highway. 

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