ABB TTR200 - HART Variables; Communication; HART Tag; Device Address

Communication and configuration
26 TTR200 OI/TTR200-EN
7.5 HART variables
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The TTR200 rail unit provides users with 3 HART variables.
The primary variable is mapped to the 4 … 20 mA output as well as the secondary and tertiary
variables.
The HART variables are assigned the following values:
- primary HART variable: Process data
(The primary HART variable is mapped permanently to the analog output and is mapped
accordingly to the 4 ... 20 mA signal.
- secondary HART variable: Electronic unit temperature
- tertiary HART variable: electrical input
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7.6 Communication / HART tag / Device address
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For ease of identification, each HART device features a configurable 8-digit HART tag.
Standard devices are come with the HART tag “TI XXX”.
(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 by default to zero, in which state 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 HART multidrop mode. This operating mode enables users to connect up
to 15 devices in parallel to a power supply.
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.
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