PLC Input Output and Sink Source Connection kaise hota hai
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How Does a PLC Work?
There are four basic operational steps for every PLC device:
Input Scan: Identifies the status of all input devices that are connected to the PLC.
Program Scan: Implements the user-created program logic.
Output Scan: Either energizes or de-energizes all connected output devices.
Housekeeping: This includes communications with programming terminals and internal diagnostics.
What are input/output devices?
Input Device
An input device is a piece of computer hardware equipment used to provide data, and control signals to an information processing system (IPS).
Some examples of input devices include:
Switches and push buttons
Sensing devices
Limit switches
Proximity sensors
Photoelectric Sensors
Condition sensors
Vacuum switches
Temperature switches
Level switches
Pressure switches
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