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How do Encoders Motor Drives and PLCs all communicate to control lets say a conveyor or Industrial machinery?
Keko62088
In an industrial automation system, PLC is a very common system.
PLC holds the software program and some hardware.
In simpler way - PLC has a processor and Input and output cards.
Input cards receive signal from field devices. Output cards send out the control signals to filed devices. The flow of signals can be either hardwired (through cable) or through bus communication (like Ethernet or profibus ..many more) or through wireless.
Example of field devices (where inputs to PLC come from) are limit switches, Photo sensors, auxiliary contacts from motor power contactors , transmitters, encoders etc etc..
Example of field devices (to which, out put signals are applied) control valves, solenoid valves, motor contactors, etc etc.
These field devices are part of industrial machinery / conveyor. PLC Software reads the state of input signals, apply the logic written and deploys the output control signal basis the process logic.
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