A test fixture for a compact PLC device of a blade expansion architecture

Abstract

The utility model discloses a compact PLC device's test frock of blade formula extension architecture, including test bench, the characteristic is that the top of test bench is fixedly provided with test base, and the test base is provided with mounting cavity and split mounting seat from front to back, and mounting cavity is used for fixed mounting PLC main control unit, and the inside of split mounting seat is provided with a plurality of positioning clamping groove from front to back parallel equal interval, and every positioning clamping groove is used for vertical positioning and places a piece of blade formula extension module PCB board, and forms the installation gap between two adjacent blade formula extension module PCB boards, and PLC main control unit and blade formula extension module PCB board are mutually electric connection between, the advantage is through this test frock directly to blade formula extension module PCB board tests again to PCB board and carries out the shell installation, avoided the loss that must remove the shell to cause, reduced the material and manpower loss when testing, greatly promoted the test efficiency.

Description

Technical Field

[0001] This utility model relates to a test fixture for a product, and more particularly to a test fixture for a compact PLC device with a blade-type extended architecture. Background Technology

[0002] PLC control systems are a new generation of industrial control devices that incorporate microelectronics, computer technology, automatic control technology, and communication technology on the basis of traditional sequential controllers. Their purpose is to replace relays, execute logic, timers, counters, and other sequential control functions, establishing flexible remote control systems. Test fixtures can be used for factory functional testing of the PLC main control unit and blade expansion module PCBs in compact PLC devices. Factory functional testing typically includes digital and analog input / output testing, as well as other special function tests. Existing test fixtures require assembling various blade expansion module PCBs with the PLC main control unit after mounting them in plastic housings before functional testing. If the factory functional test detects a functional abnormality, the plastic housing must be disassembled for retesting of the blade expansion module PCBs, which can easily damage the plastic housing. Furthermore, testing the input / output functions of the blade expansion module PCBs separately increases the workload for testers. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a test fixture for a compact PLC device with a blade-type extended architecture that has a simple structure and convenient testing process, and will not cause damage to the structure itself during testing.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a test fixture for a compact PLC device with a blade-type expansion architecture, including a test platform, a test base fixedly installed on the top surface of the test platform, an installation cavity and a split mounting seat arranged from front to back on the test base, the installation cavity being used to fix and install the PLC main control unit, and multiple positioning slots arranged parallel and equally spaced from front to back inside the split mounting seat, each positioning slot being used to vertically position and place a blade-type expansion module PCB board, an installation gap being formed between two adjacent blade-type expansion module PCB boards, and the PLC main control unit being electrically connected to the blade-type expansion module PCB board.

[0005] Compared with the prior art, the advantage of this utility model is that the PCB board of the blade expansion module is tested directly by the test fixture before the shell is installed on the PCB board. This avoids the loss caused by removing the shell when the test module malfunctions, which is necessary in the existing test bench. It also reduces the material and manpower consumption during testing and greatly improves the testing efficiency. During testing, the PLC main control unit is fixedly installed in the mounting cavity, and the blade-type expansion module PCB board is vertically positioned in the positioning slot and electrically connected to the PLC main control unit. The PLC main control unit is connected to the external host computer through a wiring harness for relevant testing. The connection method and connection structure do not change the existing structure. The original blade-type plug-in components are used to achieve connection and mutual signal transmission. The overall structure is simple, and the installation and disassembly are relatively flexible and convenient.

[0006] The split mounting base includes a first mounting block and a second mounting block arranged opposite to each other. The first mounting block has multiple first positioning slots evenly spaced from front to back. The second mounting block has multiple second positioning slots evenly spaced from front to back, each corresponding to one of the first positioning slots. The first and second positioning slots together form the positioning slot. This design is easy to process and shape, and facilitates vertical placement and positioning of the blade-type expansion module PCB board.

[0007] A mounting guide rail is fixedly installed at the bottom of the mounting cavity along the front-to-back direction. The mounting guide rail engages with a locking buckle on the bottom of the PLC main control unit. A clamping frame is vertically fixed on the test base. The clamping frame includes a portal-shaped strip fixing member in the middle and locking blocks on both sides of the portal-shaped strip fixing member that are integrally bent outwards. The portal-shaped strip fixing member is used to press downwards onto the PLC main control unit, and the locking blocks are fixedly connected to the test base by locking screws. By pressing the PLC main control unit downwards with the portal-shaped strip fixing member, the stability during testing and plugging / unplugging of the blade expansion module PCB board is improved, thereby effectively improving the accuracy of the test results. The mounting guide rail and the locking buckle are a conventional connection structure for mutual cooperation during PLC main control unit testing.

[0008] The test bench has an internal mounting cavity, within which a built-in power module with an external socket is fixedly installed. This built-in power module provides operating voltage to the PLC main control unit. A power switch on the test bench controls the on / off state of the built-in power module, and the external socket is fixedly mounted on the test bench. The structural design is conspicuous and reasonable, facilitating timely power-off upon completion of testing.

[0009] The test base is located on one side of the top surface of the test bench, and a fixed bracket is fixedly installed on the other side of the top surface of the test bench. A touch screen display facing the test base is fixedly installed on the fixed bracket, and the touch screen display is electrically connected to the PLC main control unit. The touch screen display can intuitively display the test results, and as a further expansion solution, the control program can also be directly set on the touch screen display, thereby facilitating on-site operation, control, and debugging. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the actual testing process in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the actual testing process in Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the structure of the blade-type expansion module PCB board in Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the unloaded structure of Embodiment 2 of this utility model. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0012] Example 1: A test fixture for a compact PLC device with a blade-type extended architecture includes a test platform 1. A test base 2 is fixedly mounted on the top surface of the test platform 1. The test base 2 has a mounting cavity 3 and a split mounting seat 4 arranged from front to back. The mounting cavity 3 is used to fix the PLC main control unit 5. A mounting guide rail 31 is fixedly mounted on the bottom of the mounting cavity 3 along the front-back direction. The mounting guide rail 31 is engaged with the locking buckle on the bottom of the PLC main control unit 5. A clamping frame is vertically fixed on the test base 2. The clamping frame includes a portal-shaped strip fixing member 61 located in the middle and locking blocks 62 located on both sides of the portal-shaped strip fixing member 61 and integrally bent outwards. The portal-shaped strip fixing member 61 is used to press down on the PLC main control unit 5. The locking blocks 62 are fixedly connected to the test base 2 by locking screws 63 to prevent the PLC main control unit 5 from sliding and misaligning with the mounting guide rail 31 during testing, thereby improving the stability of the testing process.

[0013] The test bench 1 has an internal mounting cavity (not shown in the figure). A built-in power module (not shown in the figure) with an external socket is fixedly installed inside the mounting cavity. The built-in power module provides operating voltage to the PLC main control unit 5. A power switch 11 is installed on the test bench 1 to control the on / off state of the built-in power module. The external socket is fixedly installed on the test bench 1. The external socket has a compatible power cord for connection to an external power outlet.

[0014] The interior of the split mounting base 4 has multiple positioning slots 41 arranged parallel to each other from front to back at equal intervals. Each positioning slot 41 is used to vertically position and place a blade-type expansion module PCB board 7. An installation gap is formed between two adjacent blade-type expansion module PCB boards 7. The PLC main control unit 5 is electrically connected to the blade-type expansion module PCB board 7. The split mounting base 4 includes a first mounting block 42 and a second mounting block 43 arranged opposite to each other. The first mounting block 42 has multiple first positioning slots 411 arranged parallel to each other from front to back at equal intervals. The second mounting block 43 has multiple second positioning slots 412 arranged parallel to each other from front to back at equal intervals. The first positioning slots 411 and the second positioning slots 412 together form the positioning slots 41.

[0015] Example 2: The rest is the same as Example 1, except that the test base 2 is located on one side of the top surface of the test bench 1, and a fixed bracket 81 is fixedly installed on the other side of the top surface of the test bench 1. A touch screen display 82 with its screen facing the test base 2 is fixedly installed on the fixed bracket 81, and the touch screen display 82 is electrically connected to the PLC main control unit 5. The touch screen display 82 can display the test results intuitively, and as a further expansion solution, the control program can also be directly set on the touch screen display 82, thereby facilitating on-site operation, control and debugging. The touch screen display 82 has the test project downloaded, and a Modbus TCP connection is established with the PLC main control unit 5 through a network cable. The tester can use the buttons and other function keys on the touch screen display 82 to test whether the IO function of the blade expansion module PCB board 7 is intact.

Claims

1. A test fixture for a compact PLC device with a blade-type extended architecture, comprising a test bench, characterized in that, A test base is fixedly installed on the top surface of the test bench. The test base has an installation cavity and a split mounting seat arranged from front to back. The installation cavity is used to fix and install the PLC main control unit. The split mounting seat has multiple positioning slots arranged parallel and evenly from front to back inside. Each positioning slot is used to vertically position and place a blade expansion module PCB board. An installation gap is formed between two adjacent blade expansion module PCB boards. The PLC main control unit and the blade expansion module PCB board are electrically connected to each other.

2. The test fixture for a compact PLC device with a blade-type extended architecture according to claim 1, characterized in that... The split mounting base includes a first mounting block and a second mounting block arranged opposite to each other. The first mounting block has a plurality of first positioning grooves evenly spaced from front to back. The second mounting block has a plurality of second positioning grooves evenly spaced from front to back, each corresponding to one of the positions of the first positioning grooves. The first positioning grooves and the second positioning grooves together form the positioning slot.

3. The test fixture for a compact PLC device with a blade-type extended architecture according to claim 1, characterized in that... The bottom of the mounting cavity is fixedly provided with a mounting guide rail along the front-to-back direction. The mounting guide rail is engaged with the locking buckle on the bottom of the PLC main control unit. A clamping frame is vertically fixed on the test base. The clamping frame includes a portal strip-shaped fixing member in the middle and locking blocks on both sides of the portal strip-shaped fixing member that are bent outwards and connected as a single unit. The portal strip-shaped fixing member is used to press downwards onto the PLC main control unit. The locking blocks are fixedly connected to the test base by locking screws.

4. The test fixture for a compact PLC device with a blade-type extended architecture according to claim 1, characterized in that... The test bench has an internal mounting cavity, in which a built-in power module with an external socket is fixedly installed. The built-in power module is used to provide operating voltage to the PLC main control unit. The test bench is equipped with a power switch for controlling the on / off state of the built-in power module, and the external socket is fixedly installed on the test bench.

5. The test fixture for a compact PLC device with a blade-type extended architecture according to claim 1, characterized in that... The test base is located on one side of the top surface of the test platform, and a fixed bracket is fixedly installed on the other side of the top surface of the test platform. A touch screen display is fixedly installed on the fixed bracket, with the screen facing the test base. The touch screen display is electrically connected to the PLC main control unit.

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