Direct digital control systems
The Illustrated Guide to Mechanical Building Services, Third Edition (BG 31/2017), by David Bleicher, published by BSRIA in 2017, defines direct digital control systems (DDC) as: ‘…microprocessor-based with analogue inputs from sensors that are digitised. Some manufacturers make a distinction between DDC intended for primary plant control, such as for boilers, and those intended for secondary or terminal unit control such as fan coil units. Primary DDC units are freely programmable with control software configured for a particular method of plant control. DDC units intended specifically for terminal units usually have specific application software built in and only relatively minor configuration settings may need to be adjusted.’
Networked DDC systems: '...consist of two or more DDC controllers that are connected together enabling the exchange of information. Each controller usually controls one particular plant group and can operate autonomously in the event of communications loss. Typical examples of information exchanged between controllers are shared sensor readings, common plant start signals, and interlock signals between different plant groups. If a networked DDC system includes one or more permanent operator terminals it is classified as a building management system (BMS).'
--BSRIA
[edit] Related articles on Designing Buildings Wiki
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Electrical contractors need to understand the practical implications.
The real barrier to getting more value from digital technology.
Your guide to The Construction Reset at UKCW Birmingham.
Accommodating the Victorian and Edwardian working woman. Book review.
Rethinking passive fire protection in design
PFP demands the same level of design rigour as structure or services.
38% of Gen Zs feel safe when a fire door is wedged open.
Stunning images from around the world
Shortlist for CIOB’s Art of Building photography competition.
Guidance for conversion of traditional pre-1919 stone buildings.
Industrial heritage in the Ruhr
A marked difference to the fate of industrial landscapes in the UK.
Communities will be able to build their own clean energy.
Why diversity and inclusion matters for SMEs
CIOB’s D&I Charter shows how practical changes can support long-term growth.
Cut electricity bills to power growth
Coalition sends joint letter to the Chancellor.