Distributed control system and edge detection equipment

Abstract

The utility model relates to a distributed control system and an edge detection device, and relates to the field of industrial automation control, and the distributed control system comprises a programmable logic controller (PLC), an industrial bus, a plurality of input / output (I / O) modules and a communication cable. A PLC is connected with an industrial bus and then is connected with a plurality of I / O modules, and the I / O modules are arranged at positions close to a controlled device of field equipment (within a first set distance from the controlled device), so that distributed control is realized. In the edge detection equipment, the distributed control system can effectively control each module to realize operations of feeding, carrying, detecting, discharging and the like of the panel, so that the automation degree and the production efficiency of the equipment are improved.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to a distributed control system and an edge detection device. Background Art

[0002] In the field of industrial automation, complex logic programming is generally performed based on programmable logic controllers (PLCs) to achieve automated control. With the help of input / output (I / O) modules, field devices (such as sensors, actuators, etc.) are connected for signal conversion, and analog or digital signals at the field are converted into signals that can be recognized by the control system, and the control system's instructions are output to the field devices.

[0003] In the related art, the I / O module is usually directly plugged into the corresponding interface of the PLC, and then connected to the field equipment through cables. An I / O module may have 32 input points and 64 output points. Each I / O point may require one or more cables, so the diameter of the communication cable is relatively thick. The larger the device size, the more field devices need to be connected, the longer the communication cable required, and the more complicated the wiring. Utility Model Content

[0004] In order to solve the above problems to a certain extent, the present application provides a distributed control system and an edge detection device.

[0005] A distributed control system, comprising: a programmable logic controller PLC, an industrial bus, a plurality of input / output I / O modules, and a communication cable;

[0006] The PLC is connected to a plurality of I / O modules respectively through an industrial bus; the I / O modules are connected to corresponding controlled devices in field equipment through communication cables;

[0007] Among them, the plurality of I / O modules are respectively arranged at adjacent positions of corresponding controlled devices in the field equipment, and the adjacent positions are within a first set distance from the controlled devices.

[0008] Optionally, the PLC includes a bus communication interface module, and the I / O module includes a bus communication interface unit;

[0009] The PLC is connected to the industrial bus via the bus communication interface module;

[0010] The I / O module is connected to the industrial bus via the bus communication interface unit.

[0011] Optionally, the type of the industrial bus includes a CC-Link dedicated transmission cable;

[0012] The type of the bus communication interface module includes a CC-Link interface module;

[0013] The bus communication interface unit includes a CC-Link interface unit.

[0014] An edge detection device, comprising: a loading module, a loading and transporting module, a detection module, a unloading and transporting module, a good product unloading module, a defective product unloading module and the distributed control system as described above;

[0015] The several I / O modules in the distributed control system are respectively arranged in the vicinity of the loading module, loading and transporting module, detection module, unloading and transporting module, good product unloading module, and defective product unloading module.

[0016] Optionally, it also includes a box body, and a transport mechanism installed in the box body;

[0017] The PLC controls the loading module through the corresponding I / O module to move the panel to be inspected onto the transport mechanism; controls the loading and handling module through the corresponding I / O module to drive the transport mechanism to move along the length direction to transport the panel to be inspected to the inspection point; controls the inspection module through the corresponding I / O module to perform edge detection on the panel to be inspected; controls the unloading and handling module through the corresponding I / O module to drive the transport mechanism to move along the length direction to transport the panel to be inspected to the unloading point; controls the good product unloading module or the defective product unloading module through the corresponding I / O module according to the inspection result of the inspection module to move the panel to be inspected out of the transport mechanism.

[0018] Optionally, there are four detection modules, which are arranged around four peripheries of the transport mechanism to detect edge defects of panels.

[0019] Optionally, it also includes the main cabinet of the electric control system;

[0020] The CPU module and bus communication interface module of the PLC are arranged in the main cabinet of the electric control system.

[0021] Optionally, models of some of the I / O modules include: AJ65SBTB1-32D, AJ65SBTB1-32DT, and AJ65SBTB1-32T.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. Since the present invention adopts a distributed control system, the I / O module is arranged near the controlled device, which simplifies the wiring structure, reduces the signal transmission distance and interference, and improves the control accuracy and stability.

[0024] 2. In the present invention, the distributed control system is preferably used in the edge detection equipment. Through the precise control of the PLC and I / O modules, the automatic loading, transportation, detection and unloading of the panel are realized, which greatly improves the automation degree and production efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of a distributed control system provided in one embodiment of the present application.

[0026] Figure 2 It is a top view of an edge detection device provided in one embodiment of the present application.

[0027] Figure 3 It is a three-dimensional structural diagram of an edge detection device provided in one embodiment of the present application.

[0028] Explanation of the reference numerals: 11, PLC; 12, industrial bus; 13, I / O module; 14, communication cable; 15, controlled device. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment discloses a distributed control system, which includes a programmable logic controller PLC11, an industrial bus 12, a plurality of input / output I / O modules 13 and a communication cable 14. PLC, as a core control element, transmits data and issues instructions with each I / O module through the industrial bus. Each I / O module is arranged at a position adjacent to the corresponding controlled device 15, and establishes a connection relationship with the controlled device through a communication cable, so as to realize close and direct control operation of the controlled device. This distributed control method not only simplifies the wiring structure but also reduces the factors affecting the system performance caused by signal attenuation and external interference, thereby improving the overall operating efficiency and stability.

[0032] The "proximate position" mentioned in the present application refers to a position within a first set distance from the controlled device. The first set distance can be determined according to the specific structure of the on-site device and can be based on the convenience of installation.

[0033] During implementation, it is necessary to first select a suitable PLC model and a matching industrial bus type; secondly, determine the specific installation location of each I / O module according to the layout of the field equipment; finally, write corresponding programs to enable the PLC to effectively manage and accurately control each I / O module and the field equipment connected to these I / O modules. Those skilled in the art can make adjustments in the corresponding implementation scenarios based on actual conditions, and this application does not limit them.

[0034] The industrial bus that connects the PLC and various I / O modules generally allows multiple points to be connected through one bus. Therefore, the diameter of the industrial bus is often smaller than the diameter of the communication cable, and the layout is relatively simple.

[0035] After receiving the instructions from the host computer, the PLC will convert these instructions into corresponding control signals and send them to each I / O module through the industrial bus; after receiving these control signals, each I / O module will drive the corresponding controlled device to complete the corresponding action according to the preset logic; at the same time, each I / O module will also monitor the state changes of the controlled device in real time, and feed back this state information to the PLC for processing and analysis; the PLC will then adjust the output instructions based on the feedback information to ensure that the entire system can operate stably and efficiently.

[0036] Example 2

[0037] This embodiment describes in detail how to apply the above distributed control system in edge detection equipment. Edge detection equipment is generally used for automatic appearance inspection of liquid crystal panels after lamination. This embodiment takes the application of distributed control system in the field of liquid crystal panels as an example, which can be extended to other fields.

[0038] Edge detection equipment is used to detect edge defects of LCD panels caused by cutting, grinding and other processes. Such defective LCD panels need to be picked out. This type of detection equipment is a large-scale equipment, which is divided into loading, handling, detection, unloading and other parts. Because the equipment is large, the traditional signal transmission method is used to transmit information, which has the disadvantages of slow information transmission and interference during the transmission process.

[0039] like Figure 2 Figure 3As shown, the edge detection device is relatively large, with a length, width and height of several meters, and a complex internal structure. If the I / O module is directly plugged into the corresponding interface of the PLC, and then connected to the field device through a cable, the communication cable between the I / O module and the controlled device may be several meters long. In such a complex edge device, the layout is extremely difficult. In this embodiment, the distributed control system as described above is added to the edge detection device. Use CC-Link dedicated transmission cables that support gigabit transmission rates and have strong anti-interference capabilities to connect each distributed I / O module and the high-speed CPU module in the PLC, and arrange the high-speed CPU module and CC-Link master module in the PLC in the main cabinet of the electric control system to facilitate communication with the upper computer; arrange each distributed I / O module near each moving part, set the loading side distributed I / O module near the loading and handling module, set the loading and handling distributed I / O module near the detection module, set the detection 1 distributed I / O module and the detection 2 distributed I / O module near the detection module, set the unloading and handling distributed I / O module near the unloading and handling module, set the OK1 unloading distributed I / O module and the OK2 unloading distributed I / O module near the good unloading module, and set the unloading NG distributed I / O module near the defective unloading module.

[0040] Among them, the high-speed CPU module in the PLC can use Mitsubishi high-speed general-purpose QCPU, with 4096 I / O points, 8192 I / O device points, 1.9 ns basic operation processing speed (LD instruction), multi-CPU high-speed communication, and peripheral connection ports including USB, Ethernet and extended SRAM box. The I / O module that supports remote operation can use CC-Link master module QJ61BT11N (bus communication interface module), remote I / O module AJ65SBTB1-32D (32-bit input), AJ65SBTB1-32DT (16-bit input, 16-bit output), AJ65SBTB1-32T (32-bit output). CC-Link (Control & Communicat I / On) is an open fieldbus system with large data capacity and multi-level optional communication speed. As a network with the device layer as the core, CC-Link can not only cover the control layer, but also go deep into the sensor layer. Common network configurations include a master station and up to 64 slave stations. In this network, the master station is usually a PLC, and the slave stations include remote I / O modules, special function modules, local stations equipped with CPU and PLC, human-machine interfaces, inverters, and various field devices such as measuring instruments and valves. CC-Link has an extremely fast data transmission speed, up to 10 Mbps. It follows the RS 485 underlying communication protocol, usually uses broadcast-polling mode for communication, and supports instant communication between the master station and local stations and intelligent device stations.

[0041] When the panel to be inspected is loaded, the PLC controls the I / O interface of the loading module to drive the loading mechanism to place the panel to be inspected on the handling module. Subsequently, the PLC controls the loading and handling module to move the panel to be inspected accurately to the inspection station. At the inspection station, four inspection modules perform edge quality inspection around the panel to be inspected, and the inspection results are fed back to the PLC in real time through the I / O module. Based on the inspection feedback, the PLC will determine whether the panel to be inspected is qualified, and control the unloading and handling module to move the panel to be inspected to the corresponding unloading module (good product unloading module or defective product unloading module) to complete the classification and unloading of the panel to be inspected.

[0042] The loading, handling, testing and unloading of panels to be tested can be completed more conveniently and quickly. The panels to be tested can be automatically moved from their original positions to the inside of the testing system by using PLC and I / O modules for precise control, and can also be rotated at multiple angles to fully check the edge quality; at the same time, after the test is completed, qualified or unqualified products can be automatically transported to designated areas for subsequent processing according to the test results, thereby significantly improving the automation of the entire equipment.

[0043] The I / O modules in the distributed control system are respectively set near each functional module to ensure the timeliness and accuracy of the control signal. The I / O module and the CPU use a CC-Link dedicated transmission cable with a gigabit transmission rate and strong anti-interference ability, which can increase the signal transmission speed and reduce external harmonics and other interference.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A distributed control system, characterized in that: include: Programmable logic controller PLC, industrial bus, several input / output I / O modules, communication cables; The PLC is connected to a plurality of I / O modules respectively through an industrial bus; the I / O modules are connected to corresponding controlled devices in field equipment through communication cables; Among them, the plurality of I / O modules are respectively arranged at adjacent positions of corresponding controlled devices in the field equipment, and the adjacent positions are within a first set distance from the controlled devices.

2. The distributed control system according to claim 1, characterized in that: The PLC includes a bus communication interface module, and the I / O module includes a bus communication interface unit; The PLC is connected to the industrial bus via the bus communication interface module; The I / O module is connected to the industrial bus via the bus communication interface unit.

3. The distributed control system according to claim 2, characterized in that: The types of industrial buses include CC-Link dedicated transmission cables; The type of the bus communication interface module includes a CC-Link interface module; The bus communication interface unit includes a CC-Link interface unit.

4. An edge detection device, characterized in that: include: A loading module, a loading and handling module, a detection module, a unloading and handling module, a good product unloading module, a defective product unloading module and a distributed control system as claimed in claim 1; The several I / O modules in the distributed control system are respectively arranged in the vicinity of the loading module, loading and transporting module, detection module, unloading and transporting module, good product unloading module, and defective product unloading module.

5. The edge detection device according to claim 4, characterized in that: It also includes a box body and a transport mechanism installed in the box body; The PLC controls the loading module through the corresponding I / O module to move the panel to be inspected onto the transport mechanism; controls the loading and handling module through the corresponding I / O module to drive the transport mechanism to move along the length direction to transport the panel to be inspected to the inspection point; controls the inspection module through the corresponding I / O module to perform edge detection on the panel to be inspected; controls the unloading and handling module through the corresponding I / O module to drive the transport mechanism to move along the length direction to transport the panel to be inspected to the unloading point; controls the good product unloading module or the defective product unloading module through the corresponding I / O module according to the inspection result of the inspection module to move the panel to be inspected out of the transport mechanism.

6. The edge detection device according to claim 5, characterized in that: There are four detection modules, which are arranged around the four peripheries of the transport mechanism and are used to detect edge defects of panels.

7. The edge detection device according to claim 5 or 6, characterized in that: It also includes the main cabinet of the electric control system; The CPU module and bus communication interface module of the PLC are arranged in the main cabinet of the electric control system.

8. The edge detection device according to claim 4, characterized in that: Models of some of the I / O modules include: AJ65SBTB1-32D, AJ65SBTB1-32DT, and AJ65SBTB1-32T.

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