Universal process control device and method for developing a process control loop program

摘要: A distributed processing unit (DPU) or drop which performs process control and data acquisition functions in a system having highway linking plurality of such units. DPU functional processor accesses the local I/O interface thereby continually receiving plant information for storage digital form subsequent use transmission along highway. programs values transparent fashion, that is without regard to whether these were obtained through via The software structure made up execution support software. collection are developed at an engineer's console using programming language operates text CRT graphic display modes, latter modes allowing documentation hard copy printout. These initiated, performed consecutively, repeated specified intervals. initiates loop execution. Control have been presented as representations ladder diagrams sequential flow continuous executed achieve required operation.