BS EN 61804-4:2016 pdf free.Function blocks (FB) for process control and ElectronicDevice Description Language(EDDL) EDD interpretation.
BS EN 61804-4 There exists some differences using and interpreting EDDL based on the used communicationnetwork and device model.The different communication networks used within this part oflEC 61804 are:
HART(according to lEC 61784-1 CPF 9)
FOUNDATION fieldbus (according to lEC 61784-1 CPF 1)PROFIBUS (according to lEC 61784-1 CPF 3)
PROFINET(according to lEC 61784-2 CPF 3)
EDD examples in this standard show parts of EDD implementations and are incomplete.
EDDL keywords are written in upper case letters. lf more than one basic construct item ismeant the keyword is written in uppercase letters added with a lower case ‘s’ for exampleVARIABLEs.
The capitalized word Builtin refers to functions specified in lEC 61804-5.
EXAMPLE Builtin MenuDisplay refers to the Builtin named MenuDisplay specified in lEC 61804-5.
Most EDD applications can be characterized as either a PC application or a handheldapplication. Due to the relatively small screen of a handheld device，handheld applicationscan only display a small amount of information at any given time.On the other hand,PCapplications can provide a much more beneficial user interface， largely due to their largerscreen size.
To support the capabilities of PC applications,the MENU construct has been extended inIEC 61804-3 compared to previous definitions in IEC 61804-2.Due to the differences in theuser interfaces of PC applications and handheld applications, it is expected that many deviceswill define two MENU hierarchies – one for handheld applications and the other for PCapplications.Some MENUs may be used in both hierarchies. Therefore, the entire hierarchydoes not need to be specified twice.
Different menu structures for different classes of applications are possible.This standard shallbe used to create menu structures in an EDD that are interpreted by applications in anunambiguous way. To provide interoperability across applications，this standard shall befollowed.EDD applications use specific menus in the EDDs to show the user interface of the device(see Table 1). In addition user interface items can be described for handhelds and PCs atonce.For handhelds strings can have beside a language code, a specific country code zz tospecify shorter strings or lower resolution images (see lEC 61804-3).BS EN 61804-4 pdf download.