Good morning everyone, I am very glad to have this opportunity to take my report on PLC. The PLC, his full name is programmable logic controller. It is a computer with a single mission. Most commonly used in industrial applications, it usually lacks a monitor, keyboard, and a mouse, as it is normally programmed to operate a machine or system using but one program. Factory assembly line machinery is activated and monitored by a single PLC, but in the past hundreds of times and relays would have been required to do the task. The machine and system user rarely, if ever, interacts with the PLC’s program. When it is necessary to either edit or create the PLC program, a personal computer is usually (but not always) connected to it.
3jS7 uU In the 1960s, the American automobile industry was searching for a way to do business better. The process of sequencing control and interlock logic needed for automobile manufactory was a time consuming and arduous task. These processes required manual updating of relays timers and dedicated closed-loop controllers. When a new year’s model was coming off the drawing board, skilled electricians were called on to reset the production line. GM Hydramatic specifically requested proposal for a replacement for the old system for speeding up the process and keep costs down.
{F/q{c~] Bedford Associates, out of Bedford, Massachusetts, came up with the winning proposal , designated the 084. The 084 became the first PLC, and a new industry was born.
z : ? :亚洲国产精品va在线观看麻豆
