 |
ALPHA-VISION® Info: Processvariables |
Processvariables
SUMMARY
Prozessvarialble are information carrier having specific properties.CONTENTS
Introduction
Prozessvariables may be combined in Lists with other DataObjects.
Die _PV.dbf tables in Vision NT are different to that in AvET
About Range and Scaling
The values in the fields Measuring Range –begin/end and Scale –begin/end
are handled as shown in the graphic. 
If the fields are set to ”0” the ratio Measuring Range to Scaling is assumed to be 1 : 1.
In that case a warning is issued when exported.
Properties
| List Name: | DataObjektList |
| File extension: | .obj.xml |
| Objects: | Processvariables |
Properties of the DataObjectList
| Field (Name in Refresh- Aktionscript & XML-Dateien) | Description | according VisuNT-Field (max.Lenght) |
|---|---|---|
| Name (Name) | Name of the DataObjectList | not available |
| Description (Descr) | free Text | not available |
| UserDefinedClass (UserDefinedClass) | not relevant for Export- und AWL-Functionality | not available |
Properties of PVs
| Field (Name in Refresh- Actionscript & XML-Dateien) | Description | according VisuNT-Field (max.Lenght) |
|---|---|---|
| Name (Name) | Name of the Processvariable | _pv.dbf: pointid (22) |
| Description (Descr) | free Text | not available |
| Station (Station) | Name of the Station the PV is located at. | _pv.dbf: sname (32) |
| object number (ObjNum) | Objekt number of the PV, not editable, it is generated automatically for all DataObjects by the program when generatingObjectnumbers. | _pv.dbf: objnum (11) |
| help-ID (HelpId) | Help-ID | _mp.dbf: hiti (6) |
| Alarmdisplay (AIPI) | Name of the attached AlarmPicture | _pv.dbf: aipi (6) |
| Process connection (IOAdr) | I/O-Signal address in the Process station | _pv.dbf: plcadr_val (64) |
| Groupalarm (GrpAlarm) | ID of the assigned AlarmGroup | _pv.dbf: grpalarm (5) |
| Technologygroup (TechGrp) | ID of the assigned TechnologyGroup | _pv.dbf: tech_grp (2) |
| Event registration (EventReg) | Entry to the archive: no / Archiv / Print; Print includes Archiv | Not available: Summing up of _ectsts.dbf: archive and print |
| Initialvalue (InitValue) | Value for initialising the PV | _pv.dbf: initval (255) |
| AccessRight () | Controls the access right | _pv.dbf: FKTNUM (11) |
| Eventgroup (EventCondTable) | Name of the assigned Event Group. | _pv.dbf: ect_name (32) |
| Eventtyp (EventType) | Type of Events: Indication / Operation / disturbance / notification | _pv.dbf: evt_type (3) |
| Send hysteresis (SendDeadband) | Hysteresis for sending a value change. | _pv.dbf: sendhyst (19) |
| Measuring Range begin (RangeStartPlc) | Range Start of the value | _pv.dbf: mg_s_plc (19) |
| Measuring Range end (RangeEndPlc) | Range End of the value | _pv.dbf: mg_e_plc (19) |
| Scale Begin (RangeStartVisu) | Start of scaling range | _pv.dbf: mg_s_vis (19) |
| Scale End (RangeEndVisu) | End of scaling range | _pv.dbf: mg_e_vis (19) |
| Replacement Value (UndefValue) | Replacement Value in case the communication is disturbed. | _pv.dbf: undefval (255) |
| Measuring value type (ValueTypePlc) | Type of the Measuring value: BOOL/SINT/USINT/INT/UINT/DINT/UDINT/REAL/STRING | _pv.dbf: valtyp_plc (3) |
| Value type Visualization (ValueTypeVisu) | Type of the Dataobject: BOOL/SINT/USINT/INT/UINT/DINT/UDINT/REAL/STRING | _pv.dbf: valtyp_vis (3) |
| ScanCycle (ScanCycle) | Scan Cycle in milliseconds (Sapi-Fetch) | _pv.dbf: fetchcyc (11) |
| Unit (UnitMls) | Name of the MLS-String for the unit definition | not available - Language dependent, the Unit is defined in the PV-Language table directly. |
| Startingvalue PLC (InitValPlc) | for AbvSpu: Initial value for the PLC | not available |
| Startingvalue using PLC ? (InitValPlcFlag) | for AbvSpu: use Initial value: yes / no | not available |