1、 1 S7-200 based modular training facilities open to experimental designPLC PLC (programmable logic controller) is a micro-controller core, the computer technology, automatic control technology； communication network together network technology is an advanced automatic control device. The current PLC
2、 has become the three major branch of modern industrial automation Column (PLC, robotics, CAD / CAM), widely used in various fields of automation and control systems, various types of enterprises Industry require a certain amount of practical experience with such talent. Thus, PLC application techno
3、logy has become the industrial automation technology relevant professional technical personnel and university students to learn important lessons. Siemens SIMATIC S7-200 series are small PLC, its high price in the domestic market large market share, because of its flexible and powerful communication
4、 features and other special advanced features are increasingly the more widely used in automatic control systems 1. Siemens Automation and Drives Group is currently actively cooperate with colleges and universities Siemens to build the establishment of training center for small-scale automation, Qin
5、gdao University is one of them. Siemens to provide similar training center S7-200 training-related equipment and software development. Teachers take advantage of this favorable experimental conditions, based on the design of these devices to open .Made a number of pilot projects PLC open, so that sc
6、hool has spare capacity, enough to further strengthen the PLC application technology student learning, Understand and operate the most advanced automation equipment, the initial grasp of advanced control technologies of industrial automation and control system design technology patients, improve the
7、ir practical ability to achieve training objectives applicable talents to meet community needs for such technical personnel requirements. 1 Modular S7-200 training equipment 2 Principle and Application of PLC technology to learn and master the necessary hardware and software test platform to support
8、. Siemens automatic in my school Group set up jointly with the driver of a small automated training centers, equipped with 10 sets of training equipment S7-200, diagram at right .Figure (painted on some of the expansion module) below. The device is modular in design, the main module in addition to s
9、uperior performance, cost-effective .Higher CPU 224XP host, but also comes with text display TD400C, with special PT100 temperature transmitter, Heaters, fans, and other physical control object, basic literacy training to achieve most of experiments, people could be conducted. Siemens products for t
10、he rich function module, consider the cost and other factors, with a certain number of functional modules, including EM231 RTD temperature measurement module, EM253 position control module, EM241 Modem communication module, CP243-1 Ethernet communication module, EM277 Prefabs-DP module, SP series we
11、ighing Siwarex MS weighing module sensors and extension of six modules, connected by bus expansion unit to achieve the function of switch-free wiring, training, experiments can be used interchangeably. Also comes with HMI (Human Machine Interface) devices TP177B, OP177B, MP277, etc. A total of 10 to
12、uch-screens, hanging in the equipment rack can also be supported by a separate operation. Using the standard package of equipment S7-300 rail card installed, so that reliable and stable module is installed, and when necessary S7-300 modules can be very easy to experiment with the addition of any mod
13、ule S7-300, the S7-200 and S7-300 the installation of a common platform. This experimental equipment for teaching, training and scientific research has provided teachers, good hardware conditions. 2 PLC open to experimental design PLC courses each semester due to class a lot, by the laboratory equip
14、ment, space and curriculum hours restrictions, generally Principle and Application of PLC programs created in the experiment mainly supporting the basic instruction to practice, sequential control, a simple digital Volume control system design, such as the marquee design, automatic round trip transp
15、ortation movement control, intersection traffic lights model control, Three-tier model of control of the elevator, the part of the experiment content is based, compulsory. For the S7-200 special high-level utility function Energy-rich extension module and field communication function widely used imp
16、lementation is rarely involved. Taking into account students Ability to accept differences and experimental conditions, this part of the experiment for the content best suited to open experiment 2 , That is, relative to teachers Laboratory equipment and related information, made experimental mission
17、 requirements, prepared by the students to self test program to determine the effective efficiency measurement experiment If 3 the method of thinking so that students have more room to stimulate the students enthusiasm and initiative, ability of students to engineering practice, Ability to innovate,
18、 analyze and solve problems Ability of great importance 3 . Therefore, the use of existing experimental design Equipment, and taking into account the students learn to master the knowledge structure, design and development of some pilot projects open. 2.1 The main module design based on the opening
19、experiment Use of the main module, in addition to the completion of some basic PLC programming experiment, we can also perform some special functions 4 Experiment, Also practiced Micro / Win programming environment integrated with a variety of programming guide, are: (1) The main module includes TD4
20、00C, it is a highly cost-effective dedicated S7-200 PLCs new generation of text Display, is a simple man-machine interface device, no special configuration of HMI software, the use of Micro / WIN V4.0 SP4 to On the version of Chinese language interface in the configuration wizard to TD 5 . The confi
21、guration opening in TD400C experiments, show the user through the configuration Menu, the alarm menu, and interact with S7-200 CPU, CPU storage area for data access and editing, enabling small Type of human-computer interaction function with the control system, such as basic experiments with automat
22、ic round trip transportation control program can be realized Through the control panel to control the car motion state, and in position to reach both ends of the alarm screen limit, while TD400C modify the car to stay at the ends of time, so that the experimental effect is more rich and vivid, but a
23、lso to enable students to understand the master Production site using the actual control equipment. (2) High-speed counter, high-speed output, internal and external interrupts and other useful special features, through an open experiment Learn and master, such as the first high-speed output by PTO (
24、pulse train) output, and achieve the high-speed counter High-speed output of the PTO HSC0 count, the interrupt function by repeated HSC0 count, a programming Adjust the PWM (pulse width modulation) high-speed output, the timer interrupt to implement a second counter, and the current count value, PWM
25、 output duty cycle and other related content displayed on the TD 400C. (3) The main module with the PT100 temperature transmitter will be converted from 0 to 100 degrees C 0 10V analog input received as Into the CPU, the heater, fan and other physical control objects connected to the digital output
26、on the CPU can be realized on analog Data transformation, manual PID control programming, using the configuration wizard to complete the PID, PID parameter self-tuning function of the experiment, so that Students deeply understand and master the industrial field of analog PID control knowledge and i
27、mplementation. (4)Two S7-200 series PLC via RS232 communication cable, you can use the PPI protocol to form a Single master station communication network, can be PPI point to point communication experiment, to achieve data exchange between the two PLC, such as the I0.0 I0.7 master map to the slave s
28、tate of the Q0.0 Q0.7, from the station I0.0 I0.7 of the state map to the main station Q0.0 Q0.7, the network will allow students to experience the simple wizard to use reading and writing instruction, and extended through the formation of PPI networks can be implemented Control functions are more complex.
