By William E. Miller
Read Online or Download Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981 PDF
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Extra info for Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981
On group sequence control Closed loop control Signal processing Analog and digital Data acquisition Drive sequence control -J! Protection Power amplification Manual control (emergency) «—I Process Measurands surands and signal sources Trip Drives Fig. 1 Block diagram of a process sequence control for the s t a r t up and shut down operations of an hydroelectric power plant. ±manual & Transmitter local control Analog indicator M ) 1X1 actuator ~ V* Fig. 2. Principle of the 3 levels of an automatic process control D i s t r i b u t e d Versus C e n t r a l i z e d Computer Control Systems Set of goals (schedule, p e r f o r mances) Set of the actual results Control Panel Decisions Set of the expected results Set of the instructions Expected results Model evaluating the performances of the process Actual results ft Process Set point values of the|—εΗ control Data col lection Fig.
N. f1979). Distributed Computer Control of fossil-fired power stations. Electrical Review. Vol. 204, no. 20, May 1979. Welfonder, E. (1981). Perspektiven der Leittechnik in den 80er Jahren. VGB Kraftwerkstechnik 61, heft 3, März 1981. STEAM TEMPERATURE CONTROL | Load set point Set point »rid frequency lpir5|—^-fpiö]-^—j I Attemperator I F'"al [ I outlet temp. rflow i 1 -»&-H p + J r' FURNACE pressure i Λ F P set point K — | PRESSURE CONTROL a i r f u( 1 LOAD& FREOUENCY CUNIHOL r aot l T Required oil flow & COMBUSTION* LOAO CONTROL Fig.
Tables providing information about the state of the process are displayed on the video terminal namely: - "object status tables" giving of the main measurands a survey - "alarm tables" indicating disturbances. Logging The logs are used for documentation of the operation sequence, for error analysis, of the for chronological monitoring 30 M. Cuenod behavior of the process variables, and for recording the current system status. - elaboration of the delivery ticket given to the driver (6), These functions are performed following types of logs: - elaboration of the invoice which will be sent to the commercial department of the customer (7), with the - the event logs summarize all operation actions, status changes, alarms, limits-overruns, in the order they are received.
Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981 by William E. Miller