MMS6312原装DCS系统PLC控制模块现货库存供应

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Now there are many kinds of PLCs often used in industry. For low-end PLCs, ladder diagram instructions are similar. For medium and high-end machines, such as S7-300, many programs are compiled with language tables. The practical ladder diagram must be annotated with Chinese symbols, otherwise it is difficult to read. It seems easier to understand the equipment process or operation process before reading the ladder diagram. In case of electrical fault analysis, the reverse check method or reverse push method is generally applied, that is, according to the input and output correspondence table, find the output relay of the corresponding PLC from the fault point and start the reverse check to meet the logical relationship of its action. Experience shows that if a problem is found, the fault can be basically eliminated, because there are few fault points with two or more faults at the same timeGenerally speaking, PLC is an extremely reliable equipment with low failure rate. The probability of PLC, CPU and other hardware damage or software operation error is almost zero. If the PLC input point is not caused by strong current intrusion, it will hardly be damaged. If the normally open point of PLC output relay is not the short circuit of peripheral load or unreasonable design, the load current exceeds the rated range, and the service life of the contact is also very long. Therefore, when we find the electrical fault point, we should focus on the peripheral electrical components of PLC. We should not always suspect that there is a problem with PLC hardware or program, which is very important for rapid maintenance of faulty equipment and rapid recovery of production. Therefore, the electrical fault maintenance of PLC control circuit discussed by the author is not the PLC itself, but the peripheral electrical components in the PLC control circuit.
Make full and rational use of software and hardware resources
Commands that do not participate in the control cycle or have been put into operation before the cycle may not be connected to PLC;
 When multiple instructions control a task, they can be connected in parallel outside the PLC and then connected to an input point;
 Make full use of the internal functional soft components of PLC to fully call the intermediate state, so that the program has complete consistency and is easy to develop. At the same time, it also reduces the hardware investment and reduces the cost;
 If conditions permit, it is better to output each circuit independently to facilitate control and inspection and protect other output circuits; When an output point fails, it will only cause the corresponding output circuit out of control;
If the output is forward / reverse controlled load, it shall not only be interlocked from the internal program of PLC, but also take measures outside PLC to prevent the load from acting in two directions;
 PLC emergency stop shall be cut off by external switch to ensure safety.
 Other precautions
 Do not connect the AC power line to the input terminal to avoid burning the PLC;
 The grounding terminal shall be grounded independently and shall not be connected in series with the grounding terminal of other equipment, and the cross-sectional area of the grounding wire shall not be less than 2mm ²；
The auxiliary power supply has small power and can only drive low-power equipment (photoelectric sensors, etc.);
Some PLCs have a certain number of occupied points (i.e. empty address terminal blocks), do not connect the line;
When there is no protection in the PLC output circuit, fuses and other protection devices shall be used in series in the external circuit to prevent damage caused by load short circuit