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The input module AIH40Ex is used for the

connection of 2-wire transducers (active input

= source mode / transducer passive).

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 integrated HART controller.

The resolution is 14 bit, 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 2-wire

transmitters

■ Transmission of HART data