Techopedia Explains Master/SlaveThe master/slave model is commonly used in the technology industry, not just in electronic but in mechanical as well. In electronic technology, it is often used to simplify communication like, instead of having a separate interface to communicate with each disk drive, we can connect most of them via one interface and cable and the computer only has to communicate with one drive serving as the master, then any control command is simply propagated down to the slaves from the master.
In mechanical technology, the term can refer to the configuration of motors such as two motors connected to different drives that are acting on the same load; one drive is defined as the master, doing the speed and control of the load, whereas the slave is there to help increase the torque. In pneumatic and hydraulic systems, we also have master cylinders, which feed the pressure and control the slave cylinders.
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