AVEVA Enterprise SCADA

Telemetered data

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The analog, rate, status, multistate, and rtstring records are primarily used for sending and recording telemetry data to and from field devices.

The records hold configuration information and the following types of data:

Data acquired from telemetry field devices and the output command values sent to the devices.
Data consisting of the following:
- Manually entered values: These are used in place of telemetry values when an instrument cannot be used in the process control system. Manual values can also be used for testing. These values only affect the host-end values not the remote field values.
- Calculated data: These are numerical values generated by calculation algorithms.Calculations may be performed by Application Calculation Engine (ACE) routines stored in the RealTime database (RTDB) tables. The AVEVA Enterprise SCADA Advanced Database Editor (ADE) Administrator documentation discusses how to set up and run ACE routines. Microsoft SQL statements can also be used to produce calculated data.

Each telemetry field device is defined in one record in the appropriate RTDB table, as shown in the following table.

Table	Description
Analog	The analog table defines analog devices and their input and/or output (setpoint) capabilities (for example, pressure, voltage).
Rate	The rate table defines devices that send analog signals representing flow rates (for example, m3/h, kWh) and/or devices that send pulse counts representing accumulated quantity (for example, m3, kW).
Status	The status table defines digital devices (for example, valves, breakers) that have up to four discrete states (for example, open, closed, in transit) and up to two commands.
Multistate	The multistate table defines digital devices (for example, compressors, pumps) that have up to 256 discrete input states and are controlled by up to eight commands.
Rtstring	Records within the rtstring table are used to represent ASCII sets of characters retrieved from the device. Two examples are a date string such as 04-16-13, or a modem initialization string such as ATE0Q0V0X4.