PLC (programmable logic controller) temperature measurement expanding module
An expansion module, temperature measurement technology, applied in thermometers, measuring devices, measuring heat and other directions, can solve the problems of unsatisfactory temperature compensation effect and inaccurate temperature measurement, and achieve the effect of accurate local temperature measurement
Inactive Publication Date: 2012-04-04
深圳市合信自动化技术有限公司
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Problems solved by technology
On the one hand, the temperature sensor 14 is affected by the heat dissipation of the heat-dissipating electronic device, and on the other hand, because it is far away from the terminal block 15, there is a certain difference between the temperature measured by it and the temperature at the wiring port, resulting in temperature measurement Inaccurate, local temperature compensation is not ideal
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[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] The embodiment of the present invention provides a PLC temperature measurement expansion module, combined below Figure 2-Figure 7 The embodiment of the PLC temperature measurement expansion module of the present invention will be described.
[0020] figure 2 with image 3 It is an embodiment of the PLC temperature measurement expansion module of the present invention, such as figure 2 with image 3 As shown, the PLC temperature measurement expans...
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The invention discloses a PLC (programmable logic controller) temperature measurement expanding module, which comprises a PCB (printed circuit board). A terminal strip and a temperature sensor for realizing local temperature compensation are disposed on the PCB. The PLC temperature measurement expanding module is characterized in that the terminal strip is arranged on the PCB via a supporting arm in an aerial manner, and the temperature sensor is disposed below the aerial terminal strip. The PLC temperature measurement expanding module has the following technical advantages that on the one hand, the temperature sensor is far away from electronic devices on the PCB, particularly heating and radiating devices, influence of the heating and radiating devices to the temperature sensor, namely to local temperature measurement, is reduced, on the other hand, the temperature sensor is closers to a wiring port of the terminal strip, measured temperature is closer to the temperature of the wiring port, and accordingly, the local temperature measurement can be more accurate.
Description
technical field [0001] The invention relates to the field of Programmable Logic Controller (PLC), in particular to a PLC temperature measurement expansion module. Background technique [0002] The PLC temperature measurement expansion module has been widely used in various industrial occasions or temperature measurement and processing in life. When the PLC temperature measurement expansion module uses thermocouples for remote temperature measurement, it is necessary to know the temperature value near the near end (that is, the input port), that is, it needs to do local temperature compensation near the input port, and then it can be calculated accordingly. The measured temperature at the remote end. At present, the PLC temperature measurement expansion module generally uses a thermal resistance temperature sensor to measure the local temperature, and its structure is as follows figure 1 shown. The PLC temperature measurement expansion module includes a PCB board 11 , a he...
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IPC IPC(8): G05B19/05G01K1/20
Inventor 罗湘志杜寒峰
Owner 深圳市合信自动化技术有限公司