CENTRAL POST
The Central Post or Control Centre consists of the following:
» Central Interlocking Unit (CIU)
» Control and Display system.
The central post consists of the central interlocking unit and the control and display system, which includes the signaller control terminals, alarms and fault reporting, and event recording.
The central interlocking unit is realised through a two-out-of-two redundant architecture. The two CIUs are connected over an internal area network. Connection with the field is through wide area networks, while the con troll and display system is connected by a local area network. The CIU also has a watch-dog circuit that votes the validity of the processing and shuts down the faulty unit in the case of an error.
The trackside devices are contained in several types of equipment such as multi-object bays, trackside functional modules and harsh environment location cases.
