Programmable logic controller development1

Programmable logic controller development history origin of

1968 gm request instead of relay control device;

in 1969, the digital equipment company developed the first programmable logic controller PDP - 14, in the United States on the production line of trial is successful, general motors adopt programmatic approach is applied to the electrical control for the first time, this is the first generation of Programmable logic controller, Programmable, PLC is recognized as the first in the world.

in 1969, developed the world's first PDP - the United States 14.

in 1971, developed the first DCS - Japan 8;

in 1973, Germany developed the first PLC;

in 1974, China developed the first PLC.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor