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Hello everyone, myself Baratwas.
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In this video I will discuss about
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control wall data integration into the
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DCS system using art communication.
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In the previous videos, I already shown
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you how to fetch art transmitter
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data using art protocol.
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In industries, we have so many controls.
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These are very helpful to control the
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process parameters like pressure,
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temperature, flow, level etc. Right?
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So today I will discuss briefly about
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this control wall and its components and
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then I will show you the DCS programming
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for this uh data integration.
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If you see these control walls uh
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majority of them are pneumatic based
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These need instrument air supply to
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If you see this is the line. This is the
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This instrument A is connected to a
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air filter regulator AFR.
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Here we will set the required pressure
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the instrument air is connected to a
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wall positioner. So this is the wall
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So this is the outlet of the air for if
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you see this is connected to a wall
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So this is our wall positioner and make
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is metro and this is the inlet uh gau.
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It will show you the inlet air uh
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pressure signal and when operates uh
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this will show you the the top one it
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will show you the wall positioner
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This volume positioner mainly controls
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the amount of air supply.
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this amount of air supply is the outlet.
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The top one is the outlet. It will go to
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So this volume positioner receives this
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420 millia signal from the DCS system
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and then controls the amount of
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instrument air supply to the wallve
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actuator and then controls the wall stem
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nothing but wall open status or wall
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closed status we can maintain as per our
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let's see so this is our uh control
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volume right now I will show you the
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stem movement with respective to the DCS
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okay so this is our stem of the same
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control bar. If you see here,
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this is the indication.
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This wall position indication
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it is showing here, right? This is the
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closed status. If it moves upwards, then
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it will show you this open status.
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Right? Now, the volume is in closed
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Now, what I will do, I will give 100%
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command from the DCS system.
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In control valve the general terminology
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is uh 0% to 100% open or close commands
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we can give from the DCS system.
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So here I will give DCS command. Let's
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see. So the DCS command I given 100%.
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That means I'm sending 20 milliamp
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signal from the DCS system to this wall
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This wall positioner receives this 20
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milliamp signal. So this is the volume
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positioner. The wall positioner operates
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control wall by sending the instrument A
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Okay. If you see here,
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this is the uh feedback indication.
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This is it will show you the open status
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and it will show you the closed status
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and this stem is connected to the wall
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positioner. Say this one
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by measuring this uh angle
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the volume positioner
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uh identifies the present
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wall feedback status like let's say 70%
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open 50% open whatever it is okay let's
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say right now the command is 100%age and
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there is no uh error Okay. Then the
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volume positioner receives
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uh 100% open feedback status.
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See this volume positioner it is
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connected mechanically. Right? So this
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mechanical movement the volume
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positioner it converts into equivalent
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Now I given 75% command from the DCS
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That means sending 16 milliamp signal
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from the DCS system to the wall
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Then wall positioner accordingly
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regulates the instrument air supply.
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Then the wall status will change
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accordingly. See now given 50% and uh
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50% it is there. Now I given again on
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25% again see it reaches 25 percentage
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you can see the marking here on the this
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indication status here you can see the
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uh respective position also
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and now again I will give the zero
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percentage command again wall is fully
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we control the uh pneumatic walls
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use generally we will use uh one analog
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input signal and one analog output
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from DCS system we send 4 to 20 millia
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uh control signal okay or command signal
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to the control wall this is analog
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this is must this signal is very
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mostly uh in critical applications
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we will consider the we will take the
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feedback status from the volume
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and then we will convert this signal as
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analog input to the DCS system
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let's say DCS given 50% command signal
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then the wall open 50%age
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then the wall positioner sends
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equivalent current signal to the DCS
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right? So, command is one signal,
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feedback is another signal.
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In some control walls in a facility,
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uh we don't have this feedback status
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related analog signal module in the wall
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The wall positioner only have one analog
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input that is 4 to 20 millia signal.
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the DCS system analog output is analog
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input to the volume positioner. If you
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talk in with respective to the DCS
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system, it is analog output signal. If
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you talk with respective to wall
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positioner, it is analog input to the
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wall positioner. mostly we will uh
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discuss in terms of DCS system only.
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Okay. So right now what is the problem
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for me? The problem is I want the
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feedback signal in the DCS system
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but I don't have the respective hardware
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in the wall positioner.
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Okay. The default thing is I have to
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take via 4 to 20 millia signal only.
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That is the recommended practice.
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But somehow I don't have that and I
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don't have any space also available with
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me. But I want that feedback status in
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Again I will use the same approach.
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In the previous videos we seen that we
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can take some data using hot protocol.
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This wall positioner is a hot protocol
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based uh instrument.
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That means if I have valid license
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software everything in my DCS system
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then I can fetch this feedback status
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signal into the DCS system using hot
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Now I will implement the same approach.
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I will get this data into the DCS system
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and then I will do the required
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I will meet you in the next video. If
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you have any questions discuss with me,
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you can ask uh in the comment section.
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Remember this short course is for uh
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intermediate level persons or the
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persons who are having some experience
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in the DCS system. Okay, because I'm not
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discussing the introduction or basic
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configuration of a DCS system in this
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This is for intermediate or the persons
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who are already working and some having
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some experience in the DCS systems.
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I I'm going to create one uh
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introduction course and basically will
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programming course for the DCS system
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also. If you complete those courses then
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this can understand this course very
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Uh do like our videos, share our courses
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with your colleagues and supporters.
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Thank you. I will meet you in the next
