Abstract This paper discusses the characteristics of AB control network and communication patterns, combined with Xiamen Cigarette Factory of the network structure, described the application of the control network and its maintenance, control of the AB network of some key issues .
Key words control network; redundant network; Expanded Tobacco; application CLC: TP277 Document code: B
Application of AB ControlNet to Product Line of Dry Ice Explode Tobacco
TONG QIANG, ZHANG JUN-YING
Qinhuangdao Tobacco Machinary Co., Ltd., Qinhuangdao 066004, China
Abstract In this article the author generally analyses the characteristics and communication mode of AB ControlNet, combine with the network structure of Xiamen tobacco factory, and describes the application and maintenance of the controlnet, discuss some key problems that occur during the application of AB controlnet.
Key words ControlNet; Redundance Net; Dry Ice Explode Tobacco; Application
1 Introduction Xiamen Cigarette Factory approved by the National Tobacco Board to build a CO2 expansion of tobacco production to meet market demand. After consultations, Xiamen Cigarette Factory CO2 Expanded Tobacco ControlNet network using an automated system as the primary control network and the network structure is redundant dual network, safe and reliable operation and real time, easy to expand; system designed. Functional, easy to operate. The system is redundant ControlNet network cigarette industry is one successful application, to the domestic and international advanced level of tobacco control. The network has successfully run more than two years, stable performance, has achieved good social and economic benefits. A copy of the system introduced by the AB control network as follows: 2 AB AB outlined Control Network Control Network uses a new mode of communication, that the producer / client (Producer / Consumer) model that allows all nodes on the network, while data from a single source access to the same data, it there are stringent requirements on time for applications where the information transmission, high-speed deterministic network. It allows time for transmitting packets of data demanding, but not the stringent requirements of the transmission time impact, as the controller and the I / O devices in a high-speed communications link, a synthesis of existing various networks capacity. The network has the following advantages [1]:
????? network all nodes simultaneously, information throughput, speed, efficiency, speed, and thus to achieve precise synchronization and real-time high of network control.
????? In the same link, multi-controller independent of the I / O.
????? node can be divided into different priority levels to meet different real-time requirements.
????? information for each frame has a CRC checksum and other verification measures, data transmission error rate.
?????¤ serious failure of nodes can be automatically removed from the network to ensure the normal operation of the network.
As a controller I / O devices in a high-speed communication link is integrated with existing I / O and DH link capacity. Fully meet the tobacco industry s production requirements. 3 CO2 expansion of tobacco production network structures and characteristics of Xiamen Cigarette Factory Management System with Distributed Control, set up a central control room master station and four sub-site (see Figure 1). The PLC ControlNet network through the communication between stations, the four control room PC, and server communication via Ethernet. Completed by the PLC field monitoring, data monitoring and analysis of commitment by the workstation computer. Sub-stations operate independently. Sharing information resources through the network; the control room can monitor the operation of the sub-station, the implementation of optimal scheduling. Redundant ControlNet network master control network linked to four units under the model 1756-L55M13 of PLC, respectively, control the cold side, hot side, feed side and the discharge end of four sub-stations. Sub-stations under different circumstances, the PLC through DeviceNet [2] articulated a number of FLEX I / O and inverters; cold side and hot side of the PLC network through DH with a certain number of the SLC model 1747-K524 for monitoring combustion furnace, compressors and other equipment more independent and decentralized. This three-tier network architecture is commonly used cigarette industry, the network structure, the first layer of information layer Ethernet for the factory data collection, historical data query and maintenance procedures; second automatic control layer ControlNet network for real-time I / O control, packet transmission. The third layer device layer, the underlying equipment for low-cost, efficient information integration. Figure 1 Expanded Tobacco Xiamen CO2 production line network structure ControlNet network with high throughput, resource sharing, coaxial cable or optical fiber transmission medium to support redundant media, architecture flexible. When the communication speed of 5Mb / s, the network can reach the minimum refresh time of 2ms, addressable nodes is 99, coaxial cable transmission distance up to 3km (optical media can be achieved when using the repeater 30km). This communication speed and distance in the cigarette industry, the application is more than sufficient, according to the actual distance or plants to choose coaxial cable or optical fiber. Deterministic ControlNet network is a high-speed redundant network, when a network cable is interrupted, another cable will immediately work on communication and control has no effect, to ensure safe production. [This total of 2, the current is 1] < < Previous Next > >