Types of node#
There are two main classes of node withing the railway controller system, the command node and control nodes. Within the control node classification, there are multiple subclasses to indicate the functionality of the node and to dictate the role it has within the control system.
The command node is the central node in the railway control system. All commands are either generated by, or pass through the command node. It is responsible for making descisions based upon the client inputs, as well as its knowledge of the current state of the railway based upon previous commands as well as optional sensors placed around the network. There MUST only be one control node per railway control network.
The control node is responsible for directly interfacing with the railway infrastructure. Control nodes receive commands from the command node and adjusts its output accordingly. Each railway controller network will contain multiple control nodes that will control different aspects of the railway from the speed of the trains, to signals and points to monitoring position sensors to alert the command node when a block is occupied. There are different classes of control node.
Classes of control node#
- Speed control node#
The speed control node is responsible for controlling the speed of the trains on the track. Each node can drive one distinct line.
- Accessory control node#
The accessory control node is responsible for controlling accessories such as signals and lighting throughout the layout.
- Isolation control node#
The isolation control node is responsible for controlling the isolation sections of the network. It contains a number of relays that can be used to supply or cut power to a section of track.