Hart Universal Commands - ABB Endura ACA592-TC Operating Instructions Manual

Endura ACA592
Toroidal conductivity transmitter

9.3 HART Universal Commands

Command
Description
No.
Read Transmitter Unique
0
Identifier
1 Read Primary Variable
Read Current and % of
2
Range
Read Dynamic Variables
3
and Current
Table 9.1 HART Universal Commands
OI/ACA592/TC–EN Rev. B
Details
Expanded device type code.
Manufacturer identification code.
Manufacturer device type code.
Number of preambles.
Revision level of HART Universal Command set implemented.
Revision level of device-specific command set implemented.
Transmitter software revision level.
Transmitter hardware revision level.
Device identification number.
Process value with units.
Reads the Primary Variable as Current and a percent of the
Primary Variable Range.
The Primary Variable Current always matches the Analog
Output current of the device including alarm conditions and set
values.
Percent of Range always follows the Primary Variable, even if
the Primary Variable Current is in an alarm condition or set to a
value.
Also, the Percent of Range is not limited to values between 0 %
and 100 %, but instead tracks the Primary Variable beyond the
Range Values to the Sensor Limits when they are defined.
Read the Primary Variable Current and up to four predefined
Dynamic Variables.
The Primary Variable Current always matches the Analog
Output current of the device including alarm conditions and set
values.
The Secondary, Tertiary, and 4th Variables are defined by each
device type.
The ACA592 toroidal conductivity transmitter provides these
values:

Secondary variable –temperature

Tertiary Variable – temperature uncompensated
conductivity in µS/cm

th
4 variable – temperature compensated conductivity in
µS/cm
9 HART Communication
75