Abstract
With the rapid development of the automatic control theory, industrial control networks,
computer networks and communication networks’ technology, in modern industrial occasion
for the realization of people-oriented work ethic, reducing the intensity of work, i increasing
work efficiency, production line of automatic control system which must have high reliability
and flexibility has become an important part of the study in the development of the control
industry.
The system uses Siemens S7-300 PLC programming software STEP7 to conduct the
reasonable control procedures design, in order to be able to vividly reflect the actual operating
and controlling process, making control scheme flexible and operating simply achieving the
whole control process of alcohol distillation section.
Combined with the process of alcohol distillation section and based on the function
analysis towards PLC, in the case that taking full account of the cost, maintaining reliability and
many other factors ,this design accomplishes many important functions such as analog input
range conversion, analog volume output range conversion, the edit of digital manual program
and main program, and so on, thus it improves the system’s real-time, anti-interference and
maneuverability, meets the actual needs in industrial process, achieves flexible control scheme,
operates simply and achieves control of the whole process of alcohol distillation.
The system can conduct online- monitoring towards the operating parameters, loop control,
PID tuning, operating conditions of equipments and system fault of the ethanol distillation
system. It can effectively reduce labor intensity, save productive cost, and improve the
anti-jamming capability, the level of the automation control and the reliability of the system.
Keywords: water treatment, programmable controller, hardware
configuration
