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Redundancy output and optimal switching method based on single set of PLC analog quantity output signals

A technology of output signal and analog quantity, applied in the field of control, can solve the problems of compatibility and economical discount, it is difficult to choose such products, and the complete set of PLC is expensive

Inactive Publication Date: 2020-09-04
HEBEI TANGYIN IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0014] However, the price of the above-mentioned complete set of PLC is very expensive, and the reliability and safety requirements of all our analog output points are also different. If you need to replace the PLC card that has been applied, the compatibility and economy will be greatly improved. Discounted, if the input-output ratio, safety and environmental assessment are not recognized, it should be difficult to choose such products even for new industrial projects

Method used

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  • Redundancy output and optimal switching method based on single set of PLC analog quantity output signals

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Embodiment Construction

[0028] Below in conjunction with embodiment, further illustrate the present invention.

[0029] see figure 1 It can be seen that the redundant output and optimal switching method based on a single set of PLC analog output signals of the present invention, the implementation environment: need to be applied in modular PLCs, such as Siemens 400, 300, 1756 series of AB, etc. In a single-set PLC environment (a single-set PLC means a hardware configuration environment that has its own industrial network and is controlled by a single CPU card or a redundant CPU card), this set of PLC should be equipped with a common CPU, communication, and CPU redundancy. Additional modules, I / O modules, etc.

[0030] What needs to be explained in this embodiment is the I / 0 module in the PLC hardware integration environment.

[0031] figure 1 The PLC rack shown is actually selected from the AB series rack produced by Rockwell Company, and the selected model is 10slot 1756-A10. It is the hardware i...

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Abstract

The invention discloses a redundancy output and optimization switching method based on a single set of PLC analog quantity output signals. The problems of four basic (AO, AI, DO and DI) I / O signals ofa PLC widely applied to the field of industrial control are solved. Analog quantity output signals are affected by uniqueness of the signals received by terminal equipment and only one group of terminals for receiving the analog quantity output signals of a controlled terminal, so that redundant output and automatic optimization switching of the analog quantity output signals are difficult to realize. The robustness of the controlled equipment can be effectively improved, and unpredictable and uncontrollable faults and derived accidents thereof become controllable.

Description

technical field [0001] The invention relates to a control method, specifically a redundant output and optimal switching method based on a single set of PLC analog output signals. Background technique [0002] An equipment accident occurred in the gas release tower of Tangyin Company in the middle of 2014. Due to the high pressure of the gas in the pipeline network, it was necessary to release the gas urgently. Since the release tower in the north could not be ignited, it had to be ignited and released from the release tower in the south. However, the emission control valve of the southern emission tower is suddenly out of control, because it is a remote control cabinet, which is a single set of PLC hardware configuration environment (a single set of PLC means that it has its own industrial network and is controlled by a single CPU card or redundant CPU card. software-controlled hardware configuration environment), it was found at the scene that the AO module was damaged, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/05
CPCG05B19/052G05B2219/14014
Inventor 韩冰范亚楠刘颖郭文龙芮双怀
Owner HEBEI TANGYIN IRON & STEEL
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