Commonly used in the design of PLC control circuit of electric and text symbols - symbols

PLC control, cannot leave the design of the electrical circuit diagram, electrical graphic symbol, how to regulate the use of text symbols, need we usually get into the habit of drawing according to the national standards. Older designers used the original old logo graphic symbols, use the new national standard with a mixture of old and new phenomenon. And who graduated in the ninety s only to master the new standard.

in the mid - 80 - s, the national bureau of standards for the first time to release a batch of electrical drawings and electrical graphic symbol national standards, including GB 4728 'electrical diagrams with a graphical symbol' 13, GB 6988 'electric drawing seven, GB 5465' graphic symbol is used electrical equipment '2 item and GB 5094' project code in electrical technology, 'and so on. These standards according to the relevant IEC standards and related documentation. Original issued by the national bureau of standards in 1987, no. 079 of the electric field in the whole nation, pursuing notice electrical drawing and graphic symbols of national standards, regulations since 'on January 1, 1990, all the electrical technical documents and drawings shall be using the new national standards, are not allowed to use the old national standard again.

PLC controller electrical control, the use of electrical symbol map is relatively less, commonly used electrical symbols such as circuit breakers, contactors, relays, normally open normally closed button, electromagnetic valve, three-phase single-phase ac motor, dc motor, servo motor, transformer, reactor, mutual inductor, lights, buzzer, etc are very common, see the table below:

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