Values of communication stations
An object of Station type can acquire the following values in D2000 system:
| Object value | Description |
|---|---|
| StON | The station is communicating. |
| StOFF | The station is not communicating. The communication is disabled by operator (via control dialog boxes of process D2000 HI) or at the station configuration in process D2000 CNF. |
| StCOMERR | The occurrence of a "soft" error of the communication. This error occurs after an unsuccessful data transmission. |
| StHARDERR | The occurrence of "hard" error of the communication. This error occurs, if the communication with station is in the StCOMERR state within the period given by Time filter parameter. If the station value is StHARDERR, then all the I/O Tags of the station will pass to undefined state. |
| StSIMUL | Communication with the station is simulated. |
| StWAIT | The station is in AUTO mode. The communication is stopped. The control object value is TRUE. The requests for output are postponed and they will be executed when the control object value changes to FALSE. |
Labels of station values, which are mentioned in the first table column, may be redefined by means of configuration of system texts.
Meaning of individual flags (user attributes) of the values of Communication station
type objects.
| Flag | Meaning |
|---|---|
| FLA | Backward reading of communication station values (GETOLDVAL action) |
| FLB | Communication with a station goes via alternate communication path (MICROTEL 700 protocol only). |
| FLC | This flag signalizes the non-functional communication on primary path
when using these line categories:
|
| FLD | This flag signalizes the non-functional communication on secondary path
when using these line categories:
|
| FLE | This flag signalizes the non-functional communication on primary path of B system when using the line category SerialOverUDP System&Line Redundant. |
| FLF | This flag signalizes the non-functional communication on secondary path of B system when using the line category SerialOverUDP System&Line Redundant. |
| FLN, FLO, FLP | If the communication with a station goes via alternate communication path (MICROTEL 700 protocol only),
a combination of these flags indicates the number of the alternate communication path:
|