Technical data

116
HB EML3020 A-(en)LevelWave LR01
9.3 Connection variants
The signal converter is a 2-wire device with 4...20 mA current output and HART
®
interface.
• Multi-Drop Mode is supported
In a Multi-Drop communication system, more than 1 device is connected to a common
transmission cable.
• Burst Mode is not supported
There are two ways of using the HART
®
communication:
• as Point-to-Point connection and
• as Multi-Drop connection with 2-wire connection.
9.3.1 Point-to-Point connection - analogue / digital mode
Point-to-Point connection between the signal converter and the HART
®
Master.
The current output of the device is passive.
Also refer to Point-to-point connection on page 50.
9.3.2 Multi-Drop connection (2-wire connection)
Up to 15 devices may be installed in parallel (this signal converter and other HART
®
devices).
For an illustration of multi-drop networks, refer to Multi-drop networks on page 51.
For data on communication in multi-drop mode, refer to HART® network configuration on page
75.
9.4 HART
®
device variables
The HART® dynamic variables PV (Primary Variable), SV (Secondary Variable), TV (Third
Variable) and 4V (Fourth Variable) can be assigned to any of the device variables.
The HART
®
dynamic variable PV is always connected to the HART
®
current output which is, for
example, assigned to level measurement.