Elevator car roof junction box detection device using CAN communication function of PLC

Abstract

The utility model discloses an elevator car top junction box detection device utilizing a CAN communication function of a PLC. The elevator car top junction box detection device is characterized by comprising a PLC detection box shell, a plug-in wiring port, a connecting cable, a 24V switching power supply and a digital detection step sequence counting display, the programmable controller PLC is at least provided with a CAN communication port and a programming port, the programmable controller PLC is provided with more than 32 I / O ports, the physical layer of the CAN communication port meets the CAN communication standard, and the baud rate can be freely programmed; and the plug-in wiring port has the same plug-in wiring port and standard as the car roof wiring box. The detection task is completed directly, independently, simply, quickly and efficiently in the states of finding wrong display parts and the like, line missing detection is avoided, the problem of board replacement in detection is solved, the test is simpler and more convenient, the detection working efficiency is improved, and new problems and fault points caused by board replacement are eliminated.

Description

Technical Field

[0001] The utility model relates to elevator technology, in particular to an elevator car top junction box detection device utilizing the CAN communication function of a PLC. Background Art

[0002] The car top junction box is mainly equipped with key car top control panels, various connecting wires, emergency stop switches and other buttons. Conventional detection methods are either to take the junction box to a special system detection station and connect it with the control cabinet, operation box, simulation station, etc. for detection, or to use a multimeter for manual detection by staff. These traditional methods are not only complicated in the detection process, but also very labor-intensive, and are prone to missed detection points, making it difficult to ensure quality.

[0003] In order to solve this problem, the applicant has designed a detection device and obtained a patent, namely, the patent announcement number is CN219751579U, an independent detection device for an elevator car top junction box, including a line adapter board, a plug-in wiring port, a plug-in cable, a programmable controller and a digital display; the line adapter board adopts the same design as various car top control boards and is used to replace the car top control board during detection; the programmable controller is also connected to a detection circuit, a power supply and a test start switch.

[0004] However, with the development of elevator control systems using communication control, the car top junction box has a car top board with CAN communication function. As the demand increases, professional inspection tasks are also increasing. If the above-mentioned "Independent inspection device for elevator car top junction box" is used, the dedicated circuit board must be replaced for each inspection, which is a lot of work and complicated. Summary of the invention

[0005] The purpose of the utility model is to solve the above-mentioned problem and provide an elevator car top junction box detection device using the CAN communication function of PLC, which can not only perform independent detection, but also has a small relative system, high detection efficiency, simple process and reliable results, and after errors are found, they are clear at a glance and corrections are convenient and quick, while avoiding the detection of board replacement and the uncertainties caused by board replacement.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: an elevator car top junction box detection device utilizing the CAN communication function of PLC, characterized in that it includes a programmable controller PLC detection box housing, a plug-in wiring port, a connecting cable, a 24V switching power supply and a digital detection step count display.

[0007] The programmable controller PLC has at least one CAN communication port and one programming port, and has more than 32 I / O ports. The physical layer of the CAN communication port complies with the CAN communication standard, and the baud rate is freely programmable and can reach at least 115200 bit / s.

[0008] The detection box shell can reasonably install the PLC, the plug-in wiring port, the digital display board of the display, the 24V switching power supply and can reasonably wire.

[0009] The plug-in connection port of the detection device has the same plug-in connection port and standard as the car top connection box.

[0010] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the CAN communication port of the PLC can be connected to the CAN communication port of the car top board through the plug-in connection port of the detection device, the connecting cable, the plug-in connection port of the car top junction box.

[0011] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the CAN communication port of the PLC can issue communication instructions according to the CAN communication protocol of the elevator car top board, and read the required input point signal of the car top board into the PLC according to the detection sequence, or write the car top board output terminal signal required for PLC detection onto the car top board.

[0012] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the I / O port of the PLC can be connected to the plug-in wiring port of the car top junction box and the I / O port of the car top board through a connecting cable installed on the detection device.

[0013] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the PLC is also provided with an I / O port through a plug-in wiring port, and its connecting cable car top wiring socket is connected one-to-one with the power line loop, safety loop, door lock loop, maintenance and maintenance operation loop inside the car top junction box.

[0014] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the display digital display board in the detection box housing can display the steps of the PLC test.

[0015] In the aforementioned elevator car top junction box detection device utilizing the CAN communication function of the PLC, the switching power supply can provide the car top board of the car top junction box as a working power supply, and can also be used as a power supply for the PLC test and the display digital display board.

[0016] The detection device designed in the present technical scheme is composed of a line adapter board corresponding to the wiring board in the car top junction box, a programmable controller (PLC), a plug-in wiring port, a connecting cable, and a digital detection step counting display. The line adapter board replaces the car top control board to connect to the line, and the car top junction box is directly detected by the detection device.

[0017] The programmable controller (PLC) of this device has at least one CAN communication port and one programming port to meet the framing processing of communication data, including data bit filling, data block encoding, cyclic redundancy check, priority judgment, etc. It has more than 32 I / O ports. The physical layer of the CAN communication port conforms to the CAN communication standard, and the baud rate can be freely programmed to simplify the detection process and share data and functions between different software or systems. The reasonably designed API also has a good security mechanism, which can effectively control data access rights and operating scope, and improve elevator safety.

[0018] The device can correspond to various specifications of car top control boards through line adapter boards of different specifications, so that the lines on the car top control board wiring terminals are reasonably connected with the lines on the external socket of the car top junction box through the line adapter board, and the difficulty of not being able to directly detect the lines connected to the car top control board is effectively overcome by using the same-name lines.

[0019] The digital detection step counting display has high counting accuracy and an adjustable counting range. It can be adjusted according to different scenarios and needs. It can very intuitively display the working status of the device and the error codes that appear during the detection. The operator can easily find out which line has an error by looking up the operating instructions with pre-recorded error codes.

[0020] The detection device is used to detect the elevator car top junction box. The entire detection can be completed by the detection device independently without replacing the circuit board, making the test simpler and more convenient. At the same time, it eliminates new problems and fault points caused by replacing the board, and does not require the cooperation of other elevator control systems such as additional control cabinets and elevator operating boxes, let alone taking the car top junction box to a special testing table for detection.

[0021] The whole system of the device is relatively small, the workload is also small, the detection process is simple, the efficiency is high, and the detection result is more reliable than that of detection only by means of a multimeter or the like.

[0022] Compared with the prior art, the beneficial effects of the utility model are: completing the detection task in a direct, independent, simple, fast and efficient manner, displaying the error location when an error is found, avoiding missed line detection, solving the problem of detecting and replacing boards, making the test more concise and convenient, improving the detection work efficiency, and eliminating new problems and fault points caused by board replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a wiring principle diagram.

[0024] Figure 2 and Figure 3 Flow chart of the working procedure of the utility model. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, this embodiment is an elevator car top junction box detection device using the CAN communication function of PLC, including a programmable controller PLC detection box housing, a detection device end plug-in wiring port installed on the housing, individual or bundled connecting cables, a 24V switching power supply and a digital detection step count display.

[0027] The programmable controller has at least one CAN communication port and one programming port, and is equipped with more than 32 I / O ports. The physical layer of the CAN communication port complies with the CAN communication standard, the baud rate is freely programmable, and can reach at least 115200bit / s. If the domestic MS3U series PLC is used, it meets the use requirements.

[0028] The shell of the detection box can be of moderate size, which can properly install the PLC, plug-in wiring port, display digital display board, 24V switching power supply and reasonable wiring.

[0029] The plug-in connection port of the detection device has the same socket and standard as the car top junction box of the product under test, and the car top junction box can be easily connected to the detection device through a connecting cable.

[0030] The CAN communication port of the PLC is connected to the CAN port of the car top board of the car top junction box of the tested product through the detection device plug-in wiring port and the connecting cable, and the input and output ports of other PLCs are respectively connected to the corresponding wiring ports of the car top junction box.

[0031] The CAN communication port of the PLC can issue communication instructions according to the CAN communication protocol of the elevator car top board of the product under test, read the required input point signal of the car top board into the PLC according to the detection sequence, or write the car top board output terminal signal required by the PLC detection to the car top board.

[0032] The I / O port of the PLC can be connected to the I / O port of the car top board through the plug-in connection port installed on the detection device of this embodiment, the connection cable and the plug-in port of the car top connection box. The PLC must also have an I / O port that is connected to the power line circuit, safety circuit, door lock circuit, maintenance and maintenance operation circuit inside the car top connection box of the product under test through the plug-in connection port, the connection cable, the car top connection socket.

[0033] In addition, the display digital display board in the test box shell can display the steps of the PLC test. The switching power supply can provide the car top board of the car top junction box of the tested product as the working power supply, and can also be used as the power supply for the PLC test and digital display board.

[0034] The working detection process of this embodiment is as follows: Figure 2 , Figure 3 :

[0035] 1) According to the requirements of the car top board in the car top junction box of the product under test, compile the CAN communication protocol of the PLC.

[0036] 2) Read and write the status of the I / O points in the order of the address of the CTB and the address of the I / O port on the CTB.

[0037] 3) Each time the PLC reads or writes the status of an I / O port of the car top board, it first outputs a signal to the I / O port or reads a signal through the plug-in wiring port and the connecting cable.

[0038] 4) During the PLC communication reading and writing process, if the signal read from the communication port or the signal written out is inconsistent with the signal output from the PLC I / O port or the signal input, the PLC program stops at this step of testing. If they are consistent, it proceeds to the next step of testing.

[0039] 5) After the PLC communication completes the car top board I / O detection, it enters the power line circuit, safety circuit, door lock circuit, maintenance and maintenance operation circuit inside the car top junction box for detection.

[0040] 6) PLC's inspection of the power line circuit, safety circuit, door lock circuit, maintenance and maintenance operation circuit follows the steps from the PLC output through the corresponding circuit in the car top junction box, and then back to the PLC input point for testing. If any step fails the test, it will stay at this step. If it passes, it will test the next step.

[0041] 7) When the PLC detects a step, it outputs the step number of the step to the speed limit board through BCD code. When all step sequence detections are completed, the BCD code "99" is output to the display board.

[0042] 8) When the display panel shows "99", it means the test is completed.

[0043] The above embodiments are illustrations of the present invention, not limitations of the present invention. Without departing from the principles of the present technical solution, any equivalent changes or equivalent modifications made in accordance with the technical ideas proposed by the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An elevator car top junction box detection device using the CAN communication function of PLC, characterized in that: It includes a PLC test box housing, a plug-in connection port, a connecting cable, a 24V switching power supply and a digital test step counting display; The programmable controller PLC has at least one CAN communication port and one programming port, more than 32 I / O ports, and the baud rate can be freely programmed and can reach at least 115200 bit / s; The detection box shell can reasonably install the PLC, plug-in wiring port, digital display board of the display, 24V switching power supply and can be reasonably wired; The plug-in connection port of the detection device has a plug-in connection port that is consistent with that of the car top connection box.

2. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1 is characterized in that: The CAN communication port of the PLC can be connected to the CAN communication port of the car top board through the plug-in connection port of the detection device, the plug-in connection port of the connecting cable and the car top connection box.

3. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1 is characterized in that: The CAN communication port of the PLC can issue communication instructions according to the CAN communication protocol of the elevator car top board, read the required input point signal of the car top board into the PLC according to the detection sequence, or write the car top board output terminal signal required by the PLC detection to the car top board.

4. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1 is characterized in that: The I / O port of the PLC can be connected to the plug-in connection port installed on the detection device, the connection cable and the plug-in connection port of the car top connection box and the I / O port of the car top board.

5. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1 is characterized in that: The PLC is also provided with an I / O port which is connected to the cable car top wiring socket through a plug-in wiring port and is connected one-to-one with the power line circuit, safety circuit, door lock circuit, maintenance and maintenance operation circuit inside the car top wiring box.

6. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1, characterized in that: The display digital display board in the detection box shell can display the steps of the PLC test.

7. The elevator car top junction box detection device using the CAN communication function of PLC according to claim 1, characterized in that: The switch power supply can provide the car top board of the car top junction box as a working power supply, and can also be used as a power supply for PLC testing and a display digital display board.

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