Toggling Via Hardware - ABB LWT300 Series User Manual

NOTICE
For instrument configuration with software tools running on a PC, you must disconnect
the LWT from the flow computer/RTU.
When you are done configuring the instrument remotely via a HART/RS-485 connection with a
PC, you must toggle the communication mode back to Operation; otherwise the instrument
will not be able to resume sending data when reconnected to the Modbus network.

Toggling via hardware

Hardware configuration is performed via dip switches, as explained below.
WARNING
All connections must be established in a de-energized state. Before working on the circuit,
secure the breaker to prevent any accidental power-up.
In an explosion proof/flameproof installation, do not remove the covers while the
instrument is energized.
NOTICE
DIP switch settings always have priority over HMI settings.
1 Make sure that the instrument is powered off and that the M4 hex head locking screws are screwed
in (see Figure 49).
2 Unscrew the housing cover on the HMI side (hazardous area warnings must be heeded; see "Safety"
on page 1).
CAUTION
Do not grab the instrument by its threaded interface. Thread edges are sharp and
constitute a risk of personal injury (see Figure 20 on page 29).
3 Pull the HMI board away from the communication board. You gain access to the communication
board.
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User Guide