LEADER 02313oam 2200385zu 450 001 996215157903316 005 20210807003554.0 035 $a(CKB)111026746731816 035 $a(SSID)ssj0000450673 035 $a(PQKBManifestationID)12140503 035 $a(PQKBTitleCode)TC0000450673 035 $a(PQKBWorkID)10444781 035 $a(PQKB)10898490 035 $a(NjHacI)99111026746731816 035 $a(EXLCZ)99111026746731816 100 $a20160829d1988 uy 101 0 $aeng 135 $aur||||||||||| 181 $ctxt 182 $cc 183 $acr 200 00$aIEEE Workshop on Visual Languages (VL88), 4th, 1988: Proceedings 210 31$a[Place of publication not identified]$cIEEE Computer Society Press$d1988 215 $a1 online resource $cillustrations 300 $aBibliographic Level Mode of Issuance: Monograph 311 $a0-8186-0876-5 330 $aDistributed process control has gained in impetus over recent years as an alternative to central control systems. The object-oriented paradigm lends itself well to the description of such distributed systems. The Oscar model of active objects embodies this paradigm, and a support environment for the design and implementation of process control systems built on this model is outlined. A graphical system description language based on an extended GRAFCET notation is described. This language is used to specify the interobject messaging and action required for a particular control task. The parsing of the diagram provides the code for controlling a system. A higher-level iconic approach to the description of control strategies is also described. By restricting themselves to the domain of process control, the authors have been able to make substantial progress in the provision of an integrated support environment. The environment incorporates the notions of visual programming techniques and combines iconic and object-oriented paradigms to produce a consistent interface metaphor. 606 $aVisual programming languages (Computer science)$vCongresses 615 0$aVisual programming languages (Computer science) 676 $a006.66 801 0$bPQKB 906 $aBOOK 912 $a996215157903316 996 $aIEEE Workshop on Visual Languages (VL88), 4th, 1988: Proceedings$92534393 997 $aUNISA