Fault reason determining method for PLC logic instruction control of blast furnace valve
A logic instruction and fault control technology, which is applied to the program control and electrical program control of sequence/logic controllers, can solve the problems of few standardized methods, difficult troubleshooting, and shutdown of blast furnaces, etc.
Active Publication Date: 2019-06-07
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
[0002] For many control devices such as blast furnace valves, the interlocking conditions are complicated. Once a certain condition is not met, the entire interlocking will stop, and the equipment of the action will stop. Therefore, often a certain signal is not in place, resulting in blast furnace failure. The production accidents that stop production are precisely because of the many interlocking conditions and complex intermediate conditions. It is very difficult to eliminate them, and often the solution is very simple. How to determine the fault conditions, there are various methods in the current technology, but the main It is a list method, that is, to display the external signals related to a certain device through an independent screen of the client. When a fault occurs, the operator will observe through the screen to find conditions that do not meet the operation. This list method can only display a small part of the signal , the internal interlocks are usually not fully enumerated, and the interlocks of logical instructions include "and logic", "or logic" and other instructions, and the enumeration method is a very large data structure, so the current conventional methods are for some external
[0003] Domestically, various diagnostic methods have been developed for independent systems, but there are relatively few standardized methods, and judgments with a small amount of information have their own characteristics, and it is difficult to unify and learn from them.
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Embodiment 1
[0028] Embodiment 1: see Figure 1-Figure 4 , a method for judging the cause of a blast furnace valve PLC logic command control fault, the method is as follows; 1) the blast furnace top valve controlled by the PLC logic command can realize the judgment of all abnormal states, and the fault one is in the process of normally opening but suddenly shuts down, Fault 2: when the machine cannot be turned on, 2) quickly determine that the cause of the fault is within the set range, so as to quickly eliminate the fault.
[0029] Fault 1 analysis: During the operation of the output coil, that is, the basic information of the basic terminal factors are all satisfied. When a fault occurs suddenly, it means that the basic information of one or two terminal factors suddenly changes from a satisfied state to a If it is not satisfied, as long as the condition factors that change when the output coil meets the output and the output suddenly stops, the fault can be determined.
[0030] The spe...
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The invention relates to a fault reason determining method for a PLC logic instruction control of a blast furnace valve. The method comprises that 1) a blast furnace roof valve controlled by a PLC logic instruction can determine all abnormal states, in a first fault, the valve is opened normally but shutdown suddenly, and in a second fault, power-on cannot be realized; and 2) the fault is determined to be within the set range rapidly, and eliminated rapidly.
Description
technical field [0001] The invention relates to a judging method, in particular to a method for judging the cause of a blast furnace valve PLC logic command control fault, and belongs to the technical field of automatic control. Background technique [0002] For many control devices such as blast furnace valves, the interlocking conditions are complicated. Once a certain condition is not met, the entire interlocking will stop, and the equipment of the action will stop. Therefore, in many cases, a certain signal is not in place, causing the blast furnace The production accidents that stop production are precisely because of the many interlocking conditions and complex intermediate conditions. It is very difficult to eliminate them, and often the solution is very simple. How to determine the fault conditions, there are various methods in the current technology, but the main It is a list method, that is, the external signal related to a certain device is displayed on an indepen...
Claims
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Inventor 吴建明季益龙
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD