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Redundancy of the KOM process - instance processes.

The KOM process can also be started in instance (shadow) mode - then several KOM processes are connected to one D2000 Server as instances (no. 1, 2 ... upto 15) of the same KOM process (e.g. [1]_REMOTE.KOM , [2]_REMOTE.KOM - see start parameter /W). One instance is active (communicating), the others are passive.
Note: in the case of server protocols (e.g. IEC 870-5-104 Server), the KOM process can also be used in active-active mode (two/more KOM processes are active).

For more information, see the Redundancy of communicationCommunication chapter.


Communication objects are configured in the D2000 Cnf tool.

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Finally, the I/O tags are configured - the parent of the  I/O tag is the communication station. The type must be defined for the I/O tag (input/output type digital/analog/integer/absolute time/relative time value). Filters, conversion to technical units, process alarms, and other parameters can be configured at the measured pointthe I/O tag.

On the I/O tag, it is also possible to configure the status text (converting a number to a text constant for the display) and the transformation palette (which determines the standard format during display, unless it is changed by a format mask).

The KOM process performs the primary processing of the values of the I/O tags. The details depend on the type of value (analog, integer, logic, four-state, text):

  • Conversion to technical units (None / Linear conversion / Polynomial conversion / Pt 100 conversion)
  • Value filtering (None / First order filter / Out of limits values are undefined / Value kept always in limits).
  • Filtering based on the defined value absorption.
  • Filtering based on the defined dead band.
  • Value limits are checked.
  • Value inversion (Boolean value)

For some protocols, it is possible to activate the reading of historical values (e.g. stored in electricity meters or data loggers) with the command GETOLDVAL. Examples of such protocols are OPC, DLMS/COSEM, IEC 62056-21:2002 Serial, Datalogger ESC8800, Datalogger ESC8816, ELGAS-2 (CP II), or IEC 870-5-104.


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titleTip

Communication tuning: on the same configuration tab as the line category is set, it is also possible to set Communication tracing - to the disk or to the screen (the process screen can be displayed with the D2000 System Console tool. Some protocols have further parameters that can be used to increase the logging level (e.g. MODBUS Client has Full Debug protocol parameter, and IEC 870-5-104 protocol has Debug Input and Debug Output parameters).

Turning on additional tuning information for a specific I/O tag(s) is possible with the command DI ON <mask>.


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titleAdvanced tips
  • The KOM process is able to start and function even without a connection to the D2000 Server (KOM Archive mode). In this mode, it works with the last known configuration and , it saves the values obtained from the communication to the disk and sends them to the D2000 Server (where they are archived) after the connection is restored. This mode is useful for remote KOM processes located on communication servers close to the technology - in case of loss of connectivity to the D2000 Server, historical data will not be lost.
  • The Generic User Protocol is intended for the implementation of simple protocols in ESL script (see links to blogs in the protocol documentation).
  • Custom protocols can be integrated into the KOM process as dynamic libraries (dll on Windows, so on Linux). The D2000 KomAPI interface is available for developing your own protocols.

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