Optional TEDS
The Optional TEDS. TEDS that can complement the mandatory TEDS.
The Optional TEDS are defined in the standard. Check this IEEE 1451.0-2024.
Optional TEDS Structure
Generic TEDS Format
TEDS ID
Calibration TEDS
Provides the calibration constants needed to translate a sensor’s output into engineering units or to convert an engineering unit’s value into the format required by an actuator. It supports two methods: the common linear method, which uses the general formula y = mx + b , and a more general method that offers greater flexibility for various calibration needs. For detailed specifications, refer to section 6.5.2.5.
Frequency Response TEDS
Provide the frequency response of the TransducerChannel. Section 6.7 for the specifications for this TEDS.
Transfer Function TEDS
Enables manufacturers to specify additional commands beyond those defined in the standard. It is primarily designed to include commands required for configuring a specific transducer and signal conditioner. Annex D provides an example schema for this TEDS, while Annex H includes a sample of the TEDS, refer to section 6.8.
Text-based TEDS
Deliver text-based information about a TIM or Transducer Channel. These TEDS can support one or more languages and include a directory to access specific language sub-blocks. They are structured with a directory followed by XML-defined TEDS blocks. For detailed specifications, refer to section 6.9.
Identification TEDS
IEEE Std 1451.2-1997 introduced several TEDS, including MetaIdentification TEDS, Channel Identification TEDS, and Calibration Identification TEDS, which provided textual information about the TIM, the Transducer Channel, and calibration details. In the current standard, these TEDS are consolidated under the category of Text-based TEDS and are not individually defined. To achieve similar functionality as described in IEEE Std 1451.2-1997, you can use the Schema provided in Annex D, along with examples in Annex E, Annex F, and Annex G. The standard also includes provisions for accessing TEDS with these names.
Geographic Location TEDS
Store static geographic location information. Users are expected to populate this TEDS to specify the installation location of the TIM. The content must adhere to the definition of a Text-based TEDS as outlined in section 6.9. The data block should be formatted using Geography Markup Language (GML), developed by the Open Geospatial Consortium (OGC) and specified in ISO/DIS 19136.
Units extension TEDS
In certain cases, particularly with chemical sensors, it may not be possible to fully represent the Physical Units using SI units. For instance, a sensor measuring the percentage of a specific chemical in a sample might use a unit ratio, listed as enumeration 1 in the units type field, with the unit being Moles. However, this does not specify the particular chemical being measured. To address this limitation, a Text-based TEDS is provided, allowing for additional text to clarify and extend the SI units.
End User Application Specific TEDS
Similar to the User’s Transducer Name TEDS in that it provides a block of memory for users to store any data they wish in any desired format. For specifications related to this TEDS, refer to section 6.10.
Manufacturer defined TEDS
Includes provisions allowing manufacturers to define TEDS that are not specified within the standard itself. The use and structure of these manufacturer-defined TEDS are at the manufacturer’s discretion, and there is no requirement for these TEDS to be accessible to users. For specific details regarding this TEDS, see section 6.11.2.3.
Security TEDS
Describes the attributes and characteristics of security protocols or standards utilized in IEEE 1451 network and transducer interfaces. It includes details such as the standard name and version. For specific specifications related to this TEDS, refer to section 6.14.
Time Synchronization TEDS
Outlines the attributes and characteristics of time synchronization protocols or standards employed in IEEE 1451 network and transducer interfaces, including details such as the standard name and version. For specific specifications related to this TEDS, refer to section 6.16.