Vulcanizing machine PLC PC monitoring software development

With the continuous improvement of the automatic control of the vulcanizing machine, vulcanizing machine temperature and pressure data acquisition recording method experienced a disc recorder, RBI recorder, intelligent paper recorder and even the more advanced PC monitoring system. PC monitoring system interface is friendly, safe and reliable control, high precision, large data storage capacity, has become increasingly favored by the users. I use resistive touch tablet PC as a PC, the field data collected through the sensor into the host computer after processing by the PLC, to form a monitoring system.

A monitoring system constitutes

The entire monitoring system consists of the A / D module, D / A module, CPU, sensors, electrical converter, Tablet PC, shown in Figure 1.

Host computer for data analysis, archiving, processing, printing, alarm, graphics, human-computer dialogue, and through the data transfer control of the PLC.

Monitoring software design

2.1 Form Designer

In the process of software programming, human-machine interface (MM) is very important, because it directly with the operator to produce the exchange of information, friendly interface requirements of the true representation of the data of the state of the control equipment and accurate acquisition of the required parameters. which rely mainly on VB 6.0 controls the mix and the original code to complete. The whole man-machine interface, including the curing status screen (main screen), real-time curve screen, the data view screen, the historical curve of the screen, the process edit screen, the alarm screen, the password screen, switch status screen can be switched between each screen. Of course, also be based on production habits edit different man-machine interface, with good flexibility.

The main screen shown in Figure 2, real-time acquisition vulcanizing machine temperature and pressure signals, and save the date for the name of the database. Show time each pot tire curing step the order parameter data, production, capsule counting, the machine current information at a glance, the bar graph controls can dynamically show that each tire curing process, and the percentage to remind the operator. If a valve is open, the main screen the name of the color change valve, pipe liquid flow animation, image representation of the changes in the status of valves, which can be in the picture control API function. The clear menu can be right about the count and yield clear. Click "Newsletter" button through the serial port to communicate with the PLC for data exchange, data acquisition frequency can be set in the Timer control. The main screen of the monitoring system of the window, basically, all operators need to understand the data are concentrated here, screen friendly and functional integrity of the man-machine interface of a direct impact on the success.

Real-time curve of the screen real-time tracking of temperature and pressure parameters of the curing press, can be divided into the disc type and line type. Disk type the habit of respect for the original disc recorder, a day as a unit, record each time the value in real time, draw an arc between the data in real-time data on a time, so that can accurately show the changes of the values. Linear one hour (general tire curing time within one hour) display unit, if the acquisition of finished one hour of data, real-time curve to collection frequency from right to left drift, then the far right of the Picture control displays the current values ??correspond to curve, the dynamic drift effect can be the WINDOWS API function. These two curves the way is different, the former can be an intuitive understanding of the curve of the day, all tires, but the host computer's display shows one days data, graphics, it is small, the resolution is not high. High-definition, but only show the mapping of the current period of time line, if you need a longer curve may view from the historical picture. In general, both applications complement each other.

The daily collection of data stored in the database the day, to see the day of the curve to open the database you can draw the history curve.

Process edit screen: all you need to modify the parameters are concentrated in the process edit screen, the sequence of steps, step-by-step, valve status, PID parameter, delay setting and curing specifications, the machine can be modified. The multi-screen functions, the operation is more complex, but mainly around the database to make a fuss. Establish a database connection with the Treeview Control, the database includes a variety of processes, each process for a table (Table). Click the table name, the contents of the table displayed in the Datagrid control, you can modify the contents of the table via the keyboard.

Other picture is not going to elaborate.

2.2 PC and PLC communication between

Host Link communications, the host machine is the main state to communicate with the PLC to command the general from the host computer sent to the PLC, any data can be sent from the PLC first-bit machine. Communication between the host computer's serial port and connect implementation, and follow the RS-232 protocol, its command format is:

@ Node title yards - the FCS check code terminator

Response code as follows:

The data is sent in units of frames, each time a calculation of the FCS and the results included in the frame FCS so that can check the frame data error www.hnjt88.com . FCS is converted into two ASC Ⅱ characters, 8-bit data, 8 data is XOR the result of the end of the start of frame data until the frame body. FCS function in VB 6.0 code as follows:

3 Conclusion

This case has been successfully applied to the automatic control system of the curing press, from the actual operation, in good condition. Of course, it needs to be constantly improve the screen so that a richer and more powerful.

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keywords: Vulcanizing machines, vacuum vulcanizing machine, hydraulic machine,