Content Description
ANSI/ASHRAE Standard 231 defines and documents a Control Description Language (CDL), a standard interchange format for the control logic in control systems. This standard is tightly connected to, and intended to work with, ASHRAE Guideline 36, Guideline 13, and ANSI/ASHRAE Standard 135 (BACnet), and other control-related standards and guidelines.
CDL can be applied to the following applications:
ASHRAE Guideline 36. Sequences of operation (SOOs) in Guideline 36 are currently written only in English. This format is mandatory for human understanding of the SOOs, but the language is inherently imprecise and ambiguous, which has led to inconsistent implementation of the SOOs. Writing the SOOs in CDL will eliminate these issues.
Simulation. CDL can be used to simulate control sequences using Spawn of EnergyPlus (SOEP) or any other tool that supports the open Modelica standard, allowing designers to determine energy efficiency effectiveness and to fine tune the logic. This simulation could also be used to demonstrate the effectiveness of Guideline 36 SOOs for a given application.
Control System Manufacturer Programming. Manufacturers of digital control systems can develop translators that convert CDL to their proprietary programming language, allowing fast and reliable ways to convert CDL for use in their commercial products. Manufacturers may also decide to change from their proprietary programming language to CDL, just as they did with BACnet. Both of these paths provide for a digital approach to deploying control sequence logic developed as part of ASHRAE Guideline 36 or from other sources.
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About ASHRAE
ASHRAE, founded in 1894, is a building technology society with more than 50,000 members worldwide. The Society and its members focus on building systems, energy efficiency, indoor air quality and sustainability within the industry. Through research, standards writing, publishing and continuing education, ASHRAE shapes tomorrow’s built environment today.
ASHRAE was formed as the American Society of Heating, Refrigerating and Air-Conditioning Engineers by the merger in 1959 of American Society of Heating and Air-Conditioning Engineers (ASHAE) founded in 1894 and The American Society of Refrigerating Engineers (ASRE) founded in 1904.