1.       Control function

The full open distributed I/O system established with PROFIBUS, with rapid control over the response, high coordination synchronism and control precision, strong anti-interference capability, can program the special process procedures according to the different processes and fully meet the process requirements and the onsite control functions. It has strong expanded function, as to the points that are deemed to be controlled, monitored and protected, it can be conveniently introduced.

The control function is divided into internal and external control, the internal control means the local control, namely control over the single onsite equipment on the control cabinet so as to carry out the single commissioning and overhaul convenient. This function can be realized through the communication; the external control means the centralized control; the large and medium sized PLC of Siemens is the core of the system control; the control will be realized through PLC and the external extensive module, the operation and the monitoring will be centralized on the operation desk and the central control machine. This function is mainly realized through PROFIBUS communication