Profibus DP from redundancy technology and its application in the intelligent electric actuator ( On)

Abstract: the Profibus DP from redundancy technology and its application in the intelligent electric actuator ( On) Information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: according to the market demands for high reliability ProfibusDP control system, studies the relevant international standards, using DPC31 link layer controller as the core chip, the hardware and software collaborative design, developed in line with the PNO standard < SpecificationSlaveRedundancyV1. 。 More flow meter manufacturers choose model price quote you are welcome to inquire, here is the Profibus DP from redundancy technology and its application in the intelligent electric actuator ( On) The article details. According to the market demands for high reliability ProfibusDP control system, studies the relevant international standards, using DPC31 link layer controller as the core chip, the hardware and software collaborative design, developed in line with the PNO standard < SpecificationSlaveRedundancyV1. 2 > Requirements from standing redundancy protocol stack, and in the instrument of shares has been applied in intelligent electric actuators. 1 introduction in recent years, with the development of information technology and automation technology, new changes have taken place in control system. Fieldbus is simple, reliable, economical and practical, and a series of prominent advantages in day by day the widespread application in the control system and has become one of the hot spot of current automation technology, which based on Profibus fieldbus application zui widely. Profibus field bus through the serial communication mode, solve the industrial field of intelligent instrument and meter, controller, actuator with field device control system the information transfer between, but its system reliability has thus been restricted. In power generation and energy distribution ( Oil, gas, electricity) , mining, environmental engineering, paper pulp, steel, metallurgy, transportation, aviation and other industries to the requirement of system reliability is very high, once the serial links appear fault or communication port, so the whole production process control will be severely affected, and even an accident. Aiming at such problems, Profibus international organizations put forward at the end of 2004 & lt; SpecificationSlaveRedundancyVI。 2 > , the standard formulation established PmfibusDP fieldbus control system from the stand of redundant code. In the Profibus control system, through the way of control system redundancy, the faulty unit or serial links automatically switch to the standby unit or the undisturbed switching method of serial link system, satisfies the requirement of non-stop high availability system. There is no domestic manufacturers have conform to the specification of the redundant products available from the stand, only foreign giants such as Siemens automation products that meet the redundant specification from the station. And redundancy of electric actuators are not domestic manufacturers to launch such products. Therefore, development accord with & lt; SpecificationSlaveRe­ dundancyVI。 2 > Standard of redundancy from station equipment and electric actuators have urgent practical significance. 2 ProfibusDP redundancy technology classification and block diagram ProfibusDP redundancy technology mainly has three forms: the main redundancy and redundancy of medium, from standing redundant host redundant: Profibus master station zui throughout the Profibus field bus system is the key part of the stability and reliability of the main is the key to ensure the normal operation of the whole system, therefore, the main redundancy is very important. Redundant Profibus master station has two independent Profibus protocol stack, as well as provide a redundant data for processing the redundant processing module. Two relatively independent operation protocol stacks, one receives and processes the two messages on the bus, and then submitted to the redundant processing module, redundant processing module must be the rule for two lines of redundant data, the effective data submitted to the upper application, for the upper application, redundant link is transparent. For the downstream data, data coming from the upper application after dealing with the redundant module respectively to two ProfibusDP interface module, the further processing of backwardness to two lines of Profibus network. Redundancy master station two Profibus interface module in the normal running at the same time at work, redundancy of the working status information from the station to send diagnosis, by increasing the redundancy switching command, can in the case of redundancy from standing error initiative to switch from station. At present can be implemented by means of soft redundancy S7 - 300, standeth redundancy system can directly adopt S7 - by way of hard redundancy The 400 h system standeth redundancy. Medium redundant: mainly for redundant Profibus transmission medium in the system, in the industrial field, transmission medium zui prone to failure. Using medium redundancy mode, two redundant bus to work at the same time, the input and output data at the same time, by the redundant connection module will two road redundant data integration for all the way into the terminal after the site. So when all the medium problems, Pmfibus each node in the system still can be normal communication all the way through the other medium. From standing redundant: redundancy from station is an important part of the redundant system.

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