0:07
in this video I will discuss one
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example Suppose there is a tank and I
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want to measure the tank
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level for that purpose I need one level
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sensor this level sensor
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level and generates one output
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signal this level sensor sends this
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PLC programmable logic
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controller the output is in the form of
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mamp it is is a current
1:02
signal this level sensor is an analog
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PLC PLC receives the current signal from
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operator on the computer
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Graphics so the pl sending the signal to
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computer the communication between the
1:41
computer is in the form of digital
1:50
see the PLC receives the signal from the
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LEL sensor using 4 to 20
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PLC sends this processed level signal to
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the computer via communication digital
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communication it can be any type of
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communication that depends on the PLC
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manufacturer mostly it will be a
2:23
communication so this is the flow
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diagram from the level sens
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to the PLC and from the PLC to the
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computer I am just using the
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terminology as a computer only generally
2:42
we will call them as operator
2:45
workstations or engineering
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course I'll just use the term
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computer also if you see here
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terminology we use sensor like level
3:06
sensor pressure sensor temperature
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Industries we use level
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transmitter the transmitter mostly sends
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the signal in the form of 4 to2 20
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mamp that is why we use the word
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transmitter instead of
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sensor the sensor can be sent the signal
3:43
form but in Industries the
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standard signal is 4 to 20
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purpose the terminology we adapted is
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this sensor measures the tank
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level and generates equivalent current
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signal that current signal it will send
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PLC receives the signal and it converts
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the value in the digital
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format and finally the tank level will
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computer so that the operator or
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engineer can see the value of a tank
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level similar approach will be followed
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for any type of input signal analog
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input based on 4 to 20
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Milli one important point is we can use
4:57
any type of transmitter
5:00
for example for measuring the tank level
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we have many types of
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principles different types of
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instruments manufacturers
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Etc you can choose any of the instrument
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requirement the most common point
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between all these transmitters and inst
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instuments is that respective instrument
5:37
variable and it will generate one output
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signal will go from the transmitter to
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PLC so this is the common
5:56
concept it doesn't matter which type of
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transmitter which type of
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Technology was used in the field you can
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use same transmitter or different
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transmitters I mean same technology or
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finally that instrument measures
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variable and generates one output
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signal this you have to
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remember thank you I will meet you in
