A PLC receives information from the input side (sensors and other devices), processes this data and then sends outputs based on parameters it has been programmed for. Smart relays are a simplified, lower-cost option that can be programmed from the unit or through a computer.
Further information
On the logic module market, the PLC logic relay system is the first to combine logic, interface, and field connection levels in a single solution. This means that you can switch and control I/O signals using a single compact system.
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