Application of Coal Mine Electric GP Touch Screen on AC Traction Shearer Li Yingping, the original Rudong (Jincheng Anthracite Coal Mining Group Co., Ltd., Jincheng, Shanxi 048006) method and the transmission of picture data, explained the picture compilation on the shearer And summarized the daily attention and maintenance.
0Overview The display screen used on the AC traction shearer used by Jincheng Coal Industry Group is the GP-270S display screen produced by Japan Digital Company. The display screen is a 5-inch monochrome LCD black and white touch screen with a resolution of 320X240. A very friendly man-machine interface device, called the face of PLC, it is an intelligent operation display that replaces the traditional control panel and keyboard. It can be used for parameter setting, data display, and depicts the automatic control process in the form of curves, animations, etc. And can simplify the PLC control program.
Introduction of 1GP touch screen 1.1 Main function monitoring: It reflects PLC internal state and memory value in the form of data, curve, graph, animation, etc., so as to directly reflect the process and trend of industrial control system.
Control: You can change the internal bit status of PLC and the value of memory by touch operation, so as to participate in process control.
1.2 The main functions express the control process in the form of animation, which can realize the working condition diagram and flow chart.
The color of the indicator light changes, the opening and closing of the electrical switch blade, the switch of the baffle, the realization of one more switch, etc.
Parameter setting, data display, data table can be designed, and simulation images of operation panel can be made.
The simulation image of the operation panel can be produced, which can realize the change of the signal value and the depth of the liquid, and simulate the movement of the meter pointer or cursor.
Various alarm actions, report printing, can be connected to CCTV monitoring head, display real-time information on site.
1.3 The main features of Chinese characters display (maximum 128X128 dot matrix).
Configuration painting (part library), shorten the design time.
To compile a communication program, when setting the communication with the PLC, you only need to set the corresponding PLC function number when editing the object, and the communication can be performed during operation, and there is no need to compile a communication program.
If the original switch, indicator light, etc. are moved to the touch screen, the input and output points of the original corresponding switch, indicator light, etc. on the PLC can be omitted, thereby reducing the scale of the PLC system.
The installation direction can be freely selected according to needs, and can be installed horizontally or vertically.
1.4 Communication method Through the serial communication port of the GP series touch screen, it can be connected to PLC, this connection is called direct connection; it can also be connected to smart devices with serial communication port, such as computers, single-chip computers, single board computers, etc. This connection is called a memory connection.
direct connection. The main way of working for GP. In this mode, the GP directly reads in the data of the PLC or directly writes the data into the PLC according to the requirements of the screen display, and this communication is performed automatically, without the need to compile a special communication program, so the PLC user program can be greatly shortened burden.
When starting painting, select the corresponding PLC model (communication protocol). When creating each part and TAG element, directly specify the corresponding PLC input / output (I / O) and register (R) addresses; the GP will automatically communicate with The PLC exchanges information, directly reads or rewrites the content of the corresponding address (I / O, R) of the PLC, and changes the display content of the screen according to this, and can also input data to the PLC through the touch operation of the GP.
This type of communication can be used when devices with corresponding protocols, such as computers and single-board computers, communicate. At this time, you need to use a fixed protocol on the host computer to compile the corresponding communication program.
15 Transfer of screen data The screen made in 0, you must first transfer the screen data you made to the GP. We call this the screen data. Step 1 screen data transfer steps â‘´ Click the button in the project manager window, or select the menu Will open the screen data transfer window.
Select the command of its menu in this window or click the shortcut icon to open the transmission parameter setting window and set each transmission parameter.
Click the transfer icon in the toolbar or select the command in the menu to perform a "download" action to transfer the current project data to the GP; click the receive icon in the toolbar or select the command in the menu to perform the 'upload' action, The screen data in the GP can be stored in the specified disk file. To realize the "upload" function, you must choose to transfer the "upload" information during "download".
2 Composition of screen data transfer window When using GP to communicate with PLC, the GP must first be set up in the system. This setting can be done either on the GP unit or in the software. When the screen data is transferred to the GP unit, the factory's GP unit cannot perform any operations, and the GP can only be operated after one operation.
The 2-meter coal machine compilation screen shows that the shearer compiles 18 screens of 3 types. Monitor 6 shearer process pictures; 6 shearer alarm pictures; 6 failure and normal parameter sampling pictures.
2.1 Monitor the working process screen of the shearer. The six screens guide you in what order (according to power transmission, traction start, direction, acceleration and deceleration), and monitor the current, temperature, traction and transfer speed of the left and right cutting motors at any time Rocker arm lift status.
If a certain data exceeds the limit, the corresponding screen flashes, and the overrun alarm screen is called to draw attention to the text, and an alarm sounds at the same time.
2.2 Shearer alarm screen 6 shearer alarm screens. When the current of the left and right cutting motors exceeds 1.1 times the rated current, it is an alarm value, but it does not stop, just for attention; when the temperature of the left and right cutting motor exceeds 135 *, it is an alarm value, but it does not stop, only for attention; When the current of the left and right traction motors exceeds 1.1 times of the rated current, it is the alarm value, but it does not stop, just for attention.
2.3 Fault and normal parameter sampling screen There are also 6 screens, which mainly record the working status of the shearer.
When a fault occurs or a certain value exceeds the limit, the PLC continuously samples 6 sets of data every 5s and displays it in the form of a screen. When the shearer is working normally, it samples every 5 minutes to continuously monitor the working status for the last 30 minutes.
3 Precautions and daily maintenance must pay attention to the protection of the touch display, it is strictly prohibited to bump the touch display, and pay attention to the protection of the liquid crystal surface. If damage to the liquid crystal surface is caused, it cannot be repaired. In actual use, if the touch display is not displayed, first check whether the power supply + 24V of the touch display is supplied. This power is provided by the PLC power module. If the power supply is normal, the initial display of power transmission should appear on the touch display. The guidance screen of the working process appears. If the guidance screen does not appear after 2s, you should check whether the signal cable is reliable. That is, check the plug and the connection cable between the touch screen and the PLC. If everything is normal, you can judge it as a touch display. If the screen is faulty, you should get a new touch screen for replacement.
4 Conclusion The touch screen has a very friendly man-machine interface, and the function is very powerful. Only the display function is used on the coal mining machine. The touch function it has not been developed and used. In the future, if the underground conditions permit, consider adding its touch. Features. The application surface of the touch screen is very extensive, and can communicate directly with many commonly used PLCs. Wherever a human-machine interface is required, the touch screen can be used. Through years of use in Jincheng Coal Industry Group, the touch screen has stable and reliable performance and can fully meet the needs of production.
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