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The above two methods can be mixed organically to complete the more complex time-event hybrid triggering mode of operation. Up to 81 events can be set. A simple example is a cooling tower circulating water disinfection and algae removal system. Disinfectant to a specific concentration according to the proportion of added water flow rate added; and process requirements, in the proportion of the process of adding a weekly pulse should also be a large dose of disinfectant (such as set Friday 12-13), and asked At this point to stop adding the role of proportion. The whole programming is very simple, so complex and fluid addition tasks can be easily and accurately achieved. 3.4, Fieldbus ProFibus automatic control mode to the high degree scale petrochemical applications, the use of high-speed digital communication protocol data transmission between automation device and then form a network control system, large-capacity, high reliability, has become The development of the mainstream. After being incorporated into the German DIN standard in the early 1990s, the fieldbus ProFibus became the European standard (EN50170) again in the late nineties and has been widely adopted worldwide. It has become one of the representative protocols in fieldbus technology . Fieldbus ProFibus consists of three situations. ProFibus-DP, ProFibus-PA and ProFibus-FMS. ProFibus-DP (DecentralizedPeriphery) is defined as a decentralized peripheral fieldbus designed specifically for the exchange of high-speed data between process control systems and decentralized peripherals. The transmission medium is twisted pair or fiber optic connection RS485 transmission standard, baud rate 9.6-12Mb / s, low system cost, high speed and reliability. Fieldbus ProFibus instruction set streamlined, programming is very convenient. Metering pumps with fieldbus ProFibus communication function, with all manual adjustment functions, can easily be incorporated into advanced, distributed computerized control systems to fully utilize their various functions and become modern precision metrology Pump leader. ProMax metering pump family that is, there are three series of dozens of models equipped with fieldbus capabilities. IV Conclusion Today, the development of metering pumps has gone beyond its traditional sense of pure pursuit of capacity and material category, turn for high-precision, multi-functional and intelligent direction of development, this trend has become the world's leading metering pump manufacturers Consensus.