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 and news
Gregor Harvie argues that AI is state-sanctioned theft of IP.
Using technology to empower communities
The Community data platform; capturing the DNA of a place and fostering participation, for better design.
Heat pump and wind turbine sound calculations for PDRs
MCS publish updated sound calculation standards for permitted development installations.
Homes England creates largest housing-led site in the North
Successful, 34 hectare land acquisition with the residential allocation now completed.
Scottish apprenticeship training proposals
General support although better accountability and transparency is sought.
The history of building regulations
A story of belated action in response to crisis.
Moisture, fire safety and emerging trends in living walls
How wet is your wall?
Current policy explained and newly published consultation by the UK and Welsh Governments.
British architecture 1919–39. Book review.
Conservation of listed prefabs in Moseley.
Energy industry calls for urgent reform.
Heritage staff wellbeing at work survey.
A five minute introduction.
50th Golden anniversary ECA Edmundson apprentice award
Showcasing the very best electrotechnical and engineering services for half a century.
Welsh government consults on HRBs and reg changes
Seeking feedback on a new regulatory regime and a broad range of issues.
CIOB Client Guide (2nd edition) March 2025
Free download covering statutory dutyholder roles under the Building Safety Act and much more.