The input module AIH41Ex is used for the
connection of 4-wire transducers (passive input = sink mode / transducer active).
The module features protection class Ex ib IIC
and can be mounted in zone 1 in combination
with excom. The ignition protection type of the
inputs is Ex ia IIC.
The inputs are not galvanically isolated from
each other. When connecting the field devices, care has to be taken that all outputs are
on the same potential.
HART-compatible sensors can be connected
to the module; these will communicate with
the HART controller.

The resolution is 1 µA per digit, i.e. the analog
value between 0…21 mA is represented as a
number between 0 and 16383. For clear reading, the digitized value is displayed in a range
of 0 … 21000 and transmitted to the host system.
Up to 8 HART variables (max. 4 per channel)
can be read via the cyclical PROFIBUS data
traffic. The bidirectional exchange of variables
between the host system and the HART transmitter is implemented via PROFIBUS-DPV1.
Setting the parameters, such as wire-break/
short-circuit monitoring, measuring range,
HART communication, etc., can be carried out
channel-by-channel and is initiated exclusively
by the PROFIBUS master.

■ Input module for connection of 4-wire
transmitters
■ Transmission of HART data