Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
glossary:blong [2020/09/14 17:39] – [Migration to superBloc] grovenor | glossary:blong [2020/09/14 17:40] – [Principle of Operation] grovenor |
---|
| |
| |
The system automates the Absolute Block principle whereby trains drivers are constrained by signals that indicate the occupancy of the section ahead. Each Block Section is electrically isolated from its neighbours and is powered by its own controller, colloquially known as "a BloNg". All such "BloNgs" are powered form a common, nominally 20V DC power supply, which establishes a zero-volt reference. Each "BloNg" incorporates track circuit detection whose state is transmitted on a single signal wire to the Block Section in the rear to set the state of its Block Signal to Danger (if occupied) or Clear otherwise (ie to red or green). | The system automates the Absolute Block principle whereby trains drivers are constrained by signals that indicate the occupancy of the section ahead. Each Block Section is electrically isolated from its neighbours and is powered by its own controller, colloquially known as "a BloNg". All such "BloNgs" are powered from a common, nominally 20V DC power supply, which establishes a zero-volt reference. Each "BloNg" incorporates track circuit detection whose state is transmitted on a single signal wire to the Block Section in the rear to set the state of its Block Signal to Danger (if occupied) or Clear otherwise (ie to red or green). |
| |
| |