The automatic batching machine is composed of S7-300 series programmable controller, weighing instrument and temperature control instrument, and external printer. The temperature control instrument is connected to the analog input module of PLC, the weighing instrument is connected to the analog input module of PLC, the computer communicates with the PLC through the MPI port, and the data sharing of the two computers is realized through the HUB(8D-LINK).
020-34563445Dosing machine is a control technology that uses computer technology to monitor, operate, manage and control the production process in a centralized way. With the development of computer technology, as an advanced control technology, it has been widely used in electric power, refrigeration, chemical industry, machinery manufacturing, traffic management and other engineering fields.
The weighing Feeder automatically or semi-automatically completes the proportioning, weighing, feeding and distributing of raw materials every time until the required weighing/feeding times of each batch are completed. At this point, PLC has completed a series of operations and controls. Such as the following target value calculation, raw material target value calculation, parameter automatic correction, etc. The main screen of each raw material and its parameter setting window have relevant parameters displayed, which can be used as control reference by the operator.
The batching control system provides an operating platform for configuration work from equipment driving, data acquisition to data processing, process control, animation display and report output. It has multi-task and multi-thread functions, and its system framework adopts VC++ programming, providing rich device driver components and rich library components. Users can also expand the functions of the system at any time according to their own needs.
Make a graphic picture
According to the production operation, the required pictures are established, and interrelated static or dynamic graphic objects are generated on each picture. The screen includes buttons and menus with certain functions, real-time trend curve, historical trend curve, alarm display and so on.
Construct database
Database is the core part of configuration software, which contains the current values of all data variables. A collection of data variables is called a data dictionary. In the data dictionary, the variable names and variable types of data variables are defined, and commonly used data functions and arithmetic and logic operation modules are also provided. Using the grammar rules of C language, a command language is written to operate data variables and generate corresponding data reports.
Define animation links
The establishment of animation connection establishes a specific correspondence between the graphic objects on the screen and the data variables in the database, and when the values of the variables change, they are represented by the animation effect of the graphic objects on the screen; You can also change the values of data variables through graphical objects.
Operation and debugging
In the process of development, we can constantly use the real-time running environment to run and debug the animated graphic pictures established in the picture production system.
Realization of metering and batching function
The device driver exchanges data with peripheral I/O data acquisition hardware to acquire important parameters. The data sampling period is 500ms, and the acquired data is saved in time to generate a database. The saving period is 60,000 ms..
