Proline Promass 83E/F/O Operation Manual - FMC Technologies

Proline Promass 83Operation!Note!5.3.3 Confirming error messagesFor the sake of plant and process safety, the measuring device can be configured in such a way thatfault messages displayed ($) always have to be rectified and acknowledged locally by pressing F.Only then do the error messages disappear from the display.This option can be switched on or off by means of the "ACKNOWLEDGE FAULT MESSAGES"function (see the "Description of Device Functions" manual).• Fault messages ($) can also be reset and confirmed via the status input.• Notice messages (!) do not require acknowledgment. Note, however, that they remain visibleuntil the cause of the error has been rectified.!Note!5.4 CommunicationIn addition to local operation, the measuring device can be configured and measured values can beobtained by means of the HART protocol. Digital communication takes place using the 4-20 mAcurrent output HART. ä 30The HART protocol allows the transfer of measuring and device data between the HART master andthe field devices for configuration and diagnostics purposes. The HART master, e.g. a handheldterminal or PC-based operating programs (such as FieldCare), require device description (DD) fileswhich are used to access all the information in a HART device. Information is exclusively transferredusing so-called "commands". There are three different command groups:There are three different command groups:• Universal CommandsUniversal commands are supported and used by all HART devices. These are associated with thefollowing functionalities for example:– Recognizing HART devices– Reading digital measured values (volume flow, totalizer, etc.)• Common practice commands:Common practice commands offer functions which are supported and can be executed by mostbut not all field devices.• Device-specific commands:These commands allow access to device-specific functions which are not HART standard. Suchcommands access individual field device information, amongst other things, such as empty/fullpipe calibration values, low flow cut off settings, etc.The measuring device has access to all three command classes.List of all "Universal Commands" and "Common Practice Commands": ä 45Issue/Rev. 0.2 (12/12) MN0M022 • Page 41