本科生毕业设计（论文）
Abstract
This design is the computer control system of styrene rectify process styrene,wh-
ich is relating 100,000 tons/year ethylbenzene-styrene Device of petrochemical corpo-
ration of Chinese petroleum in Dalian. Content of this compose conclude four parts,t-
he electric schematic diagram and wiring diagram, the selection of internally piloting
Equipment, the design of hardware project, the design of monitor routine.
Lower computer adopt XIAMEN YUDIAN corporation's AI Series intelligence
instruments. Scene transducer take gotten ' s quantities into 4~20 mA standard
current, wh-ich is convert to 1~5 V voltage through the switching circuit. Artificial
Intelligen-
ce PID adjuster input this voltage and output 4~20 mA standard current. scene control
valve grade Equipment input this current-realize the autocontrol of production.The co-
re of control is in the intelligence appearance.All intelligence instruments adopt RS4-
85 to connect the networks of RS485.In order to realize the communication in the loc-
al area network,RS485 networks connect to the industrial Ethernet through the serial
port server.
Upper computer run Forcecontrol. In order to communicate with the lower com-
puter, found the I/O Equipment and setup the parameter of the communication. The p-
arameter of the upper computer and lower computer are same. Foundate the real-time
database, setup the parametric variable which is needed to regulate or evincive and di-
spose range, alarm isoparameter. Found supervisory control surface, drawn up the co-
ntrol system ' s process flow diagram ,and write ‘###’ where the paremeter is needed
to record. Connect the ‘###’ to the database which is relevant with the paremeter. On
the point of control, through write the playbook of the button,we can control the data-
II
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Vince_192012-12-09非常详细具体的论文 有117页 很全面 非常好
