Understand the development history of PLC

programmable logic controller ( PLC） * appearances in the late 1960 s. Designing such a device is the main reason of the major U. S. automakers, want to use a digital device instead of auto production line the wiring of the relay control system of heavy and complicated, to eliminate the huge costs of production.

there are some companies plan is based on DEC ( Digital equipment corporation) PDP - 8, when the use of a small computer. Molly's Bedford associates a called modular digital controller ( Later because the device, he founded the modicon company) 。 Modicon 084, the world * into commercial production of PLC.

since then, the production and process control industry application oriented software using PLC, the PLC were slowly steadily on the increase, the programmable language looks like any maintenance technician to relay ladder logic is convenient.

it is generally accepted that Molly & throughout; The invention & throughout; The PLC. However, there are many others in the birth of the milestone products has made a contribution, including dead Odo Struger ( AB company in the past, now of the rockwell automation company) 。

Molly said PLC in specific date is January 1, 1968. 35 years later, it became industrial automation zui is widely used in the field of products, each year hundreds of millions of the world market. PLC products, widely used, the structure forms ( Including embedded controller) , the price is never to $100 to more than $10000. Molly written & other; PLC的历史,告诉霍华德Hendricks” Penny, Molly said the birth of the PLC is a & other; Fable & throughout; , that is, there may or may not be the case. But he stressed that this is his memories of this life do one thing.