Digital Status Tags
Digital status tags were originally unique to VTScada, but have long since been included in the core VTS software. Digital status tags accept incoming digital data from an I/O device. A digital status tag might be used to read the status (e.g. off or on), or the mode (e.g. running or stopped) of a motor.
Note: VTS also includes pump status tags that are to be used for digital equipment processes related to pumps. For information on pump status tags and their properties, please refer to Pump Status Tags.
A digital status can be a single bit digital input or a double bit digital input. For single bit digital inputs, there are two possible states (e.g. off or on, or running or stopped), whereas for digital inputs that use two address bits, there are four possible states (e.g. opened, closed, process in action (either opening or closing), or error).
Note: Digital inputs clamp raw data values to either zero or one on each input pin (yielding a result of 0, 1, 2, or 3 for pump status and digital status tags). Analog zero yields zero, while all other values yield 1. This is effective for analog values that have discrete states (e.g. line voltage can be read for on/off), but pure analog data (e.g. velocity) will only become false when the value drops below the sensitivity of the measuring device.
The characteristics of digital status tags are summarized in the table below.
Digital Status Tag Characteristics
Tag Browser Name: Digital Status
Database Table Name: DigitalStatus
Type: Input Tag
Tag Group Memberships: Digitals, Numeric, Trenders
Log Enabled Variables: Value
Native Drawing Methods: Digital Status Tag Drawing Methods
Note: Never attempt to attach a Logger Tag to a Digital Status tag. Digital Status tags have a built in logger.
Digital Status Tag Type Properties: ID
Tab
Digital Status Tag Type Properties: I/O
Tab
Digital Status Tag Type Properties: Alarm
Setup Tab