Soft PLC application in the automated multi-layered storehouse

Soft PLC application in the automated multi-layered storehouse optical fiber cable yofc wuhan co. , LTD. , song-tao lu zhen-yu li welcome to e hall hall 6 storage/sorting equipment exhibition shelves, cantilevered shelves, fluent type shelf, beam type shelves, light shelves,. 。 。 Automated stereoscopic warehouse is nearly 10 years with automatic control and system control devices and the rapid development of database and related technology arises at the historic moment. With the development of the technology and the popularization of computer, automatic solid warehouse is efficient, reliable, and the advantages of convenient operation to accept more and more users, is increasingly widely used. In the automated warehouse of the past, the control part mostly PLC plus computer or computer and control board. With the rapid development of computer technology, computer performance and stability is greatly improved, the fieldbus technology becoming more mature, a new control method -- — Soft PLC control mode gradually formed and gradually be applied to all kinds of control field, including automated warehouse. At present, our company adopted the Austrian ROBOTECH design and manufacture of fiber optic disc three-dimensional warehouse automation, for according to certain request automatic storage and extraction fiber optic disc. The system involves control, database and decision making aspects of technology, is a relatively more complex large system. The control part adopts the TWIN CAT BECKHOFF soft PLC, with external hardware connection PROFIBUS bus is adopted, interface and the interface between the program using c + + language. In the computer PCI slot in the 4 pieces of FC310x PROFIBUS controller, external interface hardware for BK31XX series adapter, GSD BOX and the corresponding I/O module. Is shown in figure 1 of the whole system hardware configuration is as follows: the system hardware configuration motioned TWINCAT is completely open, general automation system based on PC, and provides an independent of field bus I/O interface, and closely integrated with WINDOWS operation. TWINCAT follow IEC61131 - the development of norms 3 standards, support instruction list, text structure, function blocks, ladder diagram, and sequence function table standards development mode, can according to each different be fond of flexible use. TWINCAT there are so many ways to connect with external hardware, can through the TCP/IP, field bus, or computer COM port will soft PLC real-time system and external hardware terminal connection. Using TWINCAT, we can be a common PC configuration become a PLC system, and can have multiple task execution ability. In an ordinary PC, the most we can configure the four independent PLC real-time system running at the same time, each PLC controller real-time systems with independent, ability to multitask parallel execution itself. At the same time, we can also the flexibility to specify the program running on a PC or on a bus controller. TWINCAT data connection with other NT program can easily use the Microsoft standard methods, such as: COM and DCOM, ActiveX or OPC, etc. In the TWINCAT system of our application, the real-time system is configured with two independent PLC, one of the main action as a manipulator of monitoring, another major as a conveyor belt movement monitoring. Due to have involved in the system database, the communication with the third party equipment and operation interface can't finish the work such as PLC, so developers use c + + language to write the number of interface program to complete these functions. As a result of the communication object is more, the interface is different, in order to facilitate programming and communication, the use of CORBA ( Common object request broker architecture) Technology. Here is the software configuration of the whole system hint: figure 2 system software configuration signal after a period of use, we think the TWINCAT PLC system in terms of performance or reliability can be achieved. System at the same time the price was lower than those of the traditional PLC control mode or interface card, the application of flexible, can with the current almost all common HMI software interface, conveniently should be able to get more in the field of a variety of other control applications.
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