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in this video I will discuss about
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inputs any type of sensor transmitter
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instrument these are analog inputs to
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system the control system system may be
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DCS or any type of automation
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system these are analog
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inputs in Industries mostly all these
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analog inputs are based on 4 to 20
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okay we have a PLC and one computer
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we will see some of the examples of
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inputs for example there is a
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motor and you want to measure the motor
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speed this motor speed is also an analog
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PLC and you will receive the signal in 4
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milliamp and it is AI that means analog
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PLC also some of other parameters
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related to motor are power
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consumption current value voltage value
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Etc you can take these values
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from electrical feeders or variable
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and if you have a control wall and you
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can take wall position feedback that
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means how much the wall is opened for
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70% the W is opened or 40% the wall is
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closed like that you can take
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feedback this feedback is an analog
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PLC see this is a 4 to 20 milliamp
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signal and it is AI input analog
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okay also we have many types of sensors
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flow Etc these are all analog inputs to
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also uses 4 to 20 milliamp
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signals all these are analog
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inputs and current voltage signals
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also 4 to 20 milm analog signals
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AI I shown some of the analog
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inputs which are commonly used in the
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industries there are so many variables
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available okay all these are analog
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inputs in the previous video we
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discussed one example
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transmitter the same concept you can
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apply for all these instruments
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parameters all these uses same
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concept all analog inputs based on
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current signal uses the same
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say the motor speed is 0% 0
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RPM then the PLC receives 4 milliam
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okay let's say motor speed maximum is
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RPM then the PLC receives 20
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okay the zero scale is 4
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milliamp the full scale is 20 m
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mampers your measurement may be in any
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unit that respect to transmitter or
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device calculates the equivalent current
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signal and sends the current signal to
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PLC the PLC already have configured with
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all these field instrument
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details for example the PLC is receiving
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the motor speed from this channel okay
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then the motor speed which is 0 2,000
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RPM that range and other parameters
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related to specific device are already
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configured in the PLC so the PLC knows
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data that is why whenever it receives
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it uses the precompiled data or already
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configured data and present live
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signal then calculates the respective
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process variable in this case it is
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speed so the motor speed will be
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calculated and it will be displayed on
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computer this is the concept for analog
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inputs the same concept applies to any
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type of analog input based on 4 to 20
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milliamp that is why if you have the
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basics if you have the strong
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Foundation about the 4 to 20
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milliamp you have better grip for the
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system you can easily troubleshoot the
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system you can do the maintenance you
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can do the troubleshooting you can
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attend complex issues you can solve the
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easily that is why you must know the
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basics you must have the strong grip
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system if you have strong
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Foundation any system it may be a new
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system to you it may be a old
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system you are the master
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okay instead of following
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procedures simply following the
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procedures without knowing the
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basics you are not at
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Advantage learn the basics you are the
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simple thank you I will meet you in the
