![]() This type of operation is referred to as an 'Electromechanical' method of control.īasically a relay is an electrically powered switch. ![]() Electrical power applied to the coil creates an electromagnet, the electromagnet pulls or pushes a bar with the switch contacts attached. This magnetic force is how the relay is mechanically switch over. Relays work by creating a magnetic force with power applied to it (the coil). The only (or rather the best) way to control a production machine (or any other type of machine for that matter) was to make up a control circuit with something called relays. If we delve back into the history of the PLC, or more to the point, the history of before PLC's came to be. Or, maybe our PLC Tutorial could be what you're looking for. ![]() Incidentally you can also find out what makes a PLC tick and how PLCs work here. PLC History and the origins of how they came to be!
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