PDN schematics overview

Power Distribution Network (PDN) block schematics provide an overview of the network and to allow for the configuration of network components. Power sources and vessel systems connected to them are all represented on the PDN as nodes. Nodes are connected by conduits which are shown on schematics to provide an overview of available distribution pathways for power.

PDN schematics on consoles have a canvas mode which allows them to be drawn or edited. 



Distribution nodes are the most common. They receive power from other nodes upstream from them and make power available (usually converted to a new power standard) to nodes downstream from them.

 Above: PDN block schematic example (click for detail)A node receives power via its upstream interface and supplies power via its downstream interface.


Power is delivered between nodes by conduits. A node connects to a conduit from either its upstream or downstream interface via a conduit tap. Connection to a conduit provides access to any other node also connected to that conduit via a complementary interface. For example, a node connected via an upstream interface tap will be able to receive power from any node with a downstream interface tap to the same conduit.


Schematic denotation is designed to provide information as clearly and quickly as possible.

Node Symbols

Nodes are represented by two types of symbol. The symbol for a distribution node is a rectangle enclosing data regarding the node’s designation and rating. The wider vertical line to one side of the symbol represents the node’s upstream interface.

To facilitate different schematic layouts, the node symbols are reversible. The upstream interface is always represented by the wider vertical line regardless of which side of the symbol it is on.

Tapping a distribution node symbol provides access that node’s monitoring and control interface.

The symbol for a consumption node (a vessel system, usually one of the systems being controlled by the console the schematic is displayed on) displays only system designation information and is distinguished by its extra wide upstream interface.

Consumption nodes are not touch activated – their control and monitoring interfaces will already be available on the console (or another console if an outer node – see below).

Conduit Symbols

Conduits are represented by coloured horizontal or vertical lines, with a different colour representing each distinct conduit. A conduit tap (connecting to a node) is represented by an angled line which ‘flows’ in the direction of power delivery. For example, a conduit tap to a node’s upstream interface will always meet the node symbol at a point vertically lower than it meets the connecting conduit.

Conduits are also accompanied by a control symbol, which displays designation and rating. The conduit control symbol is similar to a node symbol except that the node's wider upstream line is replaced by two adjacent parallel lines.

Tapping a conduit control symbol provides access that conduit’s monitoring and control interface.

Conduit Tap Orientation

Conduit taps may have different orientations in the schematic to support required layouts. Conduit taps may be oriented horizontally where a horizontal schematic flow is required.

Alternatively, conduit taps may be oriented vertically where a vertical schematic flow is required.