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Hello everyone. Myself Bharadwaj.
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In this video, I will discuss about loop
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In one of the previous video, we already
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discussed in this loop diagram for the
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junction box and its wiring, right? Now,
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in this video, I will discuss the
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complete FF loop diagram from the field
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to the control system.
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We know that the junction box may have
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some multiple number of field bus
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barriers and instruments are connected
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From one junction box, we receive one
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from the field to the control system.
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That means to the marshalling cabinet,
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So, from the junction box to the
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marshalling cabinet, we receive the
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And from the marshalling cabinet,
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again, the interface cable will come and
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connect to the respective system cabinet
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Now, let us see the loop diagram.
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This is the complete loop diagram for FF
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loop with three field barriers and one
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Three field barriers means what? The
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number of barriers inside the
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From each junction box, irrespective of
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the number of field bus barriers, we
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receive one cable from the junction box
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to the marshalling cabinet.
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it is called as one segment. Each
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junction box needs one segment in the
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field bus power hub. If you see here, we
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have different sections in this loop
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field junction box location, marshalling
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cabinet details, system cabinet details.
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So, we know that in the field, we have
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different number of field instruments
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and those will be connected to the
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Okay, this is the junction box inside.
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Field bus barrier, isolation switch, and
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This is field bus barrier A,
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and C. We have three barriers here.
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And each barrier have one dedicated
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All these field bus barriers internal
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trunks are connected in parallel using
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this terminal block and jumpers.
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Also, the trunk cable which is going to
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the marshalling cabinet, that is also
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connected in parallel.
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And surge protection device, terminator
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also connected in parallel using this
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terminal block with jumpers.
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Uh these are the field instruments
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connected to the respective barriers in
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From each junction box,
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we will get one pair cable or two pair
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cable. If you have a spare, then it is a
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two pair cable. Generally, we have
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spare, so we use only one pair. The
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So, that is the orange color cable,
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right? See, this is the
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cable coming from the junction box so to
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the marshalling cabinet, right?
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This is the cable entered into the
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In the marshalling cabinet,
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it will go to the surge protection
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device, right? So, this is the surge
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protection device. This cable is
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connected to the surge protection
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device. And after the surge protection
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device, it will go to the field bus
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power hub. So, this green color module
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is there, right? This is the field bus
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power hub. In each field bus power hub,
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we know that it has four segments.
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Each segment supports one field bus
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So, segment one, segment two, three, and
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four. Each segment have two power supply
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modules, the left and the right. Okay,
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these are the modules.
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And each field bus power hub have one
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diagnostic module. So, this is the
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This is the diagnostic module. You can
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see here on the left side, these
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terminals here, we can connect the cable
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coming from the surge protection device.
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This is for segment one, segment two,
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segment three, and segment four.
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If you see here, we have the plus,
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The shield is common to
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See, and connected to earth.
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If you see here, this
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field bus power hub, we have one primary
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power supply and one secondary power
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alarm feedback you can use.
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And we know that each field bus power
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hub have two connectors.
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So, this is connector one and connector
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First connector will be connected to one
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dedicated field bus module. The second
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one will be connected to second field
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Now, with the help of interface cables,
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these will be connected from the field
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from the marshalling cabinet to the
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See, this is a system cabinet.
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And these are the panel numbers,
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Okay, we are not going in-depth about
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these numbers right now.
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See, the connector one is connected to
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and connector two is connected to this
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You can get the details of your modules
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here. Let's say this is the one module.
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You can see the details of these two,
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you can see node number one. Slot number
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So, we'll go to the system cabinet.
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If you see here, how many number of
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Let's say this we call this one as node
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This line, node three. And last one,
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The lines means the way the cards are
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So, the first one is node one.
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These are all node one.
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where is this card is installed?
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Node one, slot one. This is the field
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This is my node one, the first line. And
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this is my slot one. This is the first
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card from the left side. This is slot
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This is slot two, three, four, five,
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In this model, we have eight slots for
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If you have multiple IO nodes, then the
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first six will be used for the IO
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modules. And the number seven and eight
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will be used for internal communication
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That depends on your model.
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Now, it is clear that the first
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connector is going to the node one, slot
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What is the card model?
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The model is AL F 111. This is the field
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bus card model in Yokogawa DCS system.
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Next, we'll see the connector two.
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It is coming from marshalling cabinet
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and it is going to the
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system cabinet and the respective card
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is installed in node one, slot two.
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This is the first one is slot one, the
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second one is slot two. So, these first
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two cards are related to
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this field bus power hub.
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Remember, in Yokogawa DCS system, when
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you are using a backup cards, redundant
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cards, always the both cards are
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installed side by side.
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Okay, the left and right.
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That is the Yokogawa's philosophy.
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These are the power supply, primary and
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secondary, 24 VDC from the bus bar.
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So, that's it. This is the FF loop
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Just overview the field instruments.
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It is connected to the junction box.
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From the junction box, one segment will
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be connected to the field bus power hub.
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From the field bus power hub,
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again, it is connected to
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field bus cards installed in system
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Remember, it may have one barrier, two
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barriers, three barriers. The concept is
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In the next videos, I will show you the
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detailed configuration and programming
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