Hart Variables; Communication / Hart Tag / Device Addressing; Operation; Safety Instructions - ABB TTH200 Operating Instruction

26 TTH200 HEAD-MOUNT TEMPERATURE TRANSMITTER | OI/TTH200-EN REV. B
... 9 Commissioning
... Basic Setup

HART variables

The transmitter provides three HART variables. The HART
variables are assigned the following values:
• Primary HART variable: process value
The primary HART variable is assigned permanently to the
analog output and is accordingly mapped to the 4 to 20 mA
signal.
• Secondary HART variable: electronic unit temperature
• Third-level HART variable: electric input

Communication / HART TAG / device addressing

For ease of identification, each HART device features a
configurable 8-digit HART TAG. All devices are supplied with the
HART TAG 'TI XXX' as standard. When storing HART TAG
measuring point tags with more than 8 digits in the device, use
the 'Report' parameter, which supports up to 32 characters.
In addition to the HART TAG, each device has a HART address.
This address is set to 0 by default, which means that the device
operates in HART standard communication mode (point-to-
point operation).
When an address in the range 1 to 15 is used, the device switches
to the 'HART Multidrop mode'.
This operating mode enables users to connect up to 15 devices
to a power supply unit in parallel.
In multidrop mode, an analog output signal that matches the
process temperature is not available.
The output signal in multidrop mode is a constant 3.6 mA and is
used exclusively for the power supply. In multidrop mode, sensor
or process data information is available only as a HART signal.

10 Operation

Safety instructions

If there is a chance that safe operation is no longer possible,
take the device out of operation and secure it against
unintended startup.

Process display

Note
The device does not have operating elements for
parameterization on site.
Parameterization takes place via the HART interface.
1 -
25.7
PV
1 Measuring point tagging (Device TAG)
2 Current process values
3 'Parameterization protected' symbol
Figure 17: Process display (example)
The process display appears on the LCD display when the device
is powered on. It shows information about the device and
current process values.
2
°C
100%
3
A11169