Peterbilt Motors Company, founded in 1939, is an American manufacturer of medium-and heavy-duty Class 5 through Class 8 trucks headquartered in Denton, Texas. Peterbilt operates manufacturing facilities in Denton, Texas (1980), and Sainte-Therese, ThÃ©rÃ¨se. quebec
A programmable logic controller, PLC, or programmable controller is a digital computer used for automation of typically industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures.PLCs are used in many machines, in many industries.PLCs are designed for multiple arrangements of digital and analog inputs and outputs, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact.ore recently, PLCs are programmed using application software on personal computers, which now represent the logic in graphic form instead of character symbols. The computer is connected to the PLC through Ethernet, RS-232, RS-485, or RS-422 cabling.
PLCs are classified by the number of I/O functions provided. For example, a nano PLC incorporates fewer than 32 I/Os, a micro PLC has between 32 and 128 I/Os, a small PLC has between 128 and 256 I/Os, and so on.