Real-Time database

Key Features

  • Object oriented
  • Rich properties
  • Extended attributes

 

Benefits

  • Reduce engineering time & risk of error
  • Internal tags at no cost
  • Fast and easy maintenance

 

The Real-Time database is the core of PcVue and it is composed of a set of tags called "variables" that contain the data used to be displayed in mimics, trigger actions or record.
The following variable types are supported.

  • Bit - Logical or two state data
  • Alarm - A sub-type of bit with modified behavior
  • Register - Any analogue data (byte, word, double word, float etc.)
  • Text - String data

A variable could be:

  • An Internal variable – the data value is calculated in PcVue
  • An Equipment variable  - the data value is given by the communication layer

 

Associated Behaviors

 

Associated behavior adds features to a variable in addition to that provided by its main properties. The following is a summary of the main behaviors:

  • Threshold - Set bits when the value rises above or falls below a value. Used to generate alarms from analog values
  • Chronometer - Measure the period for which a bit has been set
  • Counter - Count how many times a bit has been set
  • Discrepancy – DCS style mechanism that checks that the value of one bit follows another within a configurable period. An alarm is generated if the check fails
  • Alarm – Acknowledge trace, Associated action (open a mimic or run a script), Masking by bit or expression
  • Event - Run a program or send a message (SMS or email) on change of value
  • Trend - Record the VTQ in an archive unit for replay through a Trend Viewer or export to a 3rd party application