Hart Variables; Communication / Hart Tag / Device Addressing; Operation; Safety Instructions - ABB TTF200 Operating Instruction

28 TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. A
7.5.3

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, accordingly, to the 4 ... 20 mA
signal.)
— Secondary HART variable: electronic unit temperature
— Tertiary HART variable: electrical input
7.5.4

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
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.

8 Operation

8.1

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.

8.2 Process display

NOTICE
The device does not have operating elements for
parameterization on site.
Parameterization takes place via the HART interface.
1 -
PV
Fig. 25: Process display (example)
1 Measuring point tagging (Device TAG) 2 Current process
values 3 "Parameterization protected" symbol
The process display appears on the LCD display when the
device is powered on. It shows information about the device
and current process values.
25.7
°C
100%
3
2
A11169