Process control computer

PCC = process control computer PLC = programmable logic controller and PGCS = process gas chromatograph system. 

Computer System. The brain of the modern clinical chemistry analyzer is its computer system. The part of the computer system that controls the functional aspects of the analyzer is known as the process control computer or analytical processor (AP) the test results are handled by the data management computer, also known as the results processor (RP). 

System includes automatic actuation of most activities, with changing of feed lines to silos accomplished by diverter valves controlled automatically by process control computer. 

A high pressure gel permeation chromatograph (GPC) has been used to monitor the performance of the reactor. A novel aspect of the GPC is that, it too, has been put on-line to the process control computer and both data collection and analysis have been made automatic while giving the operator full interactive facilities. 

Strang. G., Wavelets and dilation equations A brief introduction. SIAM Rev. 31, 614 (1989). Ungar, L. H., Powell, B. A., and Kamens, S. N., Adaptive Networks for fault diagnosis and process control. Comput. Chem. Eng. 14, 561 (1990). 

Warehouses are normally considered low risk occupancies unless high value or critical components are stored. Some high valve components normally overlooked in warehouses are diamond (industrial grade) studded drill bits or critical process control computer boards. In these cases the economic benefits of installing an automatic sprinkler system should be investigated. 

Computer rooms considered in this section are those installations of substantial size and importance providing primarily data processing and network support service for multiple large process units or for an entire plant site. These installations are typically much larger than ones for an individual processing facility s dedicated process control computer. 

The saturation concentration is calculated by the software. The signal from the Merhn shows a transient peak which is measured by peak height. In addition, the time of the peak maximum is recorded, providing further identification of the mercury present. A Hnear cahbration is obtained from which analytical results are calculated. The software is also available to couple this system directly to a process control computer. 

TTie detailed information provided by the measurement of mercury is vital to the economic operation of the plant, so it is necessary to hnk the measurements directly into the process control computer. This is achieved in a simple manner by adding a digital-to-analogue converter to the control computer. Once the analytical result is calculated for any run, the result can be transferred directly by the D/A converter to the process control computer in a 0—20 mA signal. 

The automation concept implemented at Conroe is called computer production control (CPC).2 CPC systems are driven by a general purpose process-control computer (48-K core memory) centrally located and programmed to monitor production and equipment operations and perform oil and gas accounting. As shown in Fig. 11, the computer is connected to a supervisory control system with a computer interface unit (CIU) to provide remote data acquisition and control function capability. 

The external devices and processes to which the process control computer is connected all behave with respect to their own particular time-scales. When the actions of the computer are related to the time-scales of these external systems (often termed the external world) the computer is said to operate in real lime 141. Process control computers are normally concerned with real-time operations and ClVERA et al.(52) have divided the latter into ... 

Process Control Computers/Automatic Cooling Tower Control... 

The design, development, and system build phases need to deliver computer systems and services in a manner that facilitates effective and efficient system validation, operation, maintenance, modification, and upgrade. This applies to both stand-alone and embedded process control computer systems (see Sec. VI). 

Operational checks are normally presenting process control computer systems. These systems may contain code that is part of the master production record. At the system level, the purpose of operational checks is to execute algorithms, sequencing of operations, and safety-related functions as required in the applicable customer specification. Inspections and testing are fundamental processes to be performed during the validation of critical system sequences. In addition, an ongoing program must be established to frequently verify that critical operations occur in the proper sequence. 

Evaluation. The evaluation was carried out by reflectance using a Zeiss PMQ II chromatogram spectrophotometer (Zeiss, Oberkochen), with a direct link of the analogue output to an IBM 1800 process control computer. 

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