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Hello everyone, myself Baradwas. In this
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video I will show you overview of
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foundation field bus network from the
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field to the control system.
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We have FF junction boxes in the field.
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Right? In our video I will consider only
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one FF junction box for easy
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understanding. So this is our foundation
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field bus junction box
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and the field instruments are connected
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to this junction box.
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These are foundation field bus
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Remember that you have to connect only
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FF instruments to this junction box.
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And the cable between the junction box
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and the field instrument is called as
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spur cable. And we have the one trunk
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cable that is the main cable going from
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the junction box to the control system.
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This is called trunk cable. Right? This
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is also one pair cable. Irrespective of
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the number of instruments connected to
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the foundation field bus junction box,
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we will use only one pair cable for
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carrying all these devices information
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from the field to the control system.
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And this is the FF and this is called H1
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And this trunk cable will go to the
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marshalling cabinet. This is installed
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in control room. This trunk and spur
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cable is called as trunk and spur
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Now this trunk cable from the junction
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box it will go to marshalling cabinet
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which is installed in the control room.
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In the marshalling cabinet we have s
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protectors and field bus power hub or
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And from the marshling cabinet again the
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signals will go to the system cabinet.
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In system cabinet we have field bus
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System cabinet houses the electronic
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cards like power supply modules, CPU,
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IO modules, analog input, analog output,
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digital input, digital output, serial
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communication modules and foundation
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field bus modules. The cables from the
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marshalling cabinet field bus power hub
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it will go and connect to the system
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cabinet field bus cards.
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The field bus cards process all these
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foundation field bus related devices
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information and then this information
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will be supplied to the CPU. The CPU
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then process this data and updates to
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the operator screen workstations.
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In your graphics, you can see the field
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instruments parameters. Let's say the
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pressure transmitters value, low
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transmitter value, control walls,
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position feedback or the operator can
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give the uh command from the
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workstation. It will go to the system
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cabinet. The CPU will then send this
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command signal to the field bus card.
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The field bus card will uses this
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communication bus from the uh field bus
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module to the marshalling cabinet and
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then to the junction box and then to the
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field instrument control wall. In this
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case it can give the command. This is
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the overview of the foundation field bus
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network for single junction box. If you
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see here, each junction box will give us
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one pair cable from the field to the
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mastering cabinet. If you have let's say
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50 junction boxes, then you will receive
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50 number of one pair cables from the
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field to the marshalling cabinets.
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Remember, I'm just saying the actual
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requirement of the trunk cable.
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If you have a spare cable, generally
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we'll go with two pair cable for the
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trunk cable. One we will use and the
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second pair is the spare.
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I'm just showing you the actual
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requirement cable here. One pair for
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easy understanding of the topic.
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So this is the war and you know that
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what is the field section the junction
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boxes the field instruments all these
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are installed in the field. This is the
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field section and this is the control
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room section. Marshalling cabinets,
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system cabinets, workstations,
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all these are installed in a control
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So this is the simple overview of a
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field bus network. In the next videos, I
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will explain in detail about the
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marshling cabinet and its components.
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I will explain system cabinet and its
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components, wiring, everything one by
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If you have any questions, share with
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us. Do like our videos, support us.
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Thank you for your support.
