The ELX4181 analog EtherCAT output terminal allows the direct connection
of intrinsically safe HART-capable field devices located in hazardous areas
classified zone 0/20 or 1/21. For example, the ELX4181 can be used to
control intrinsically safe controllers for control valves.
The status and error LEDs provide information on the status of the HART
communication and indicate any communication errors.

The HART protocol (Highway Addressable Remote Transducer) enables
two-way communication through digital data transfer via the analog 4…20
mA wiring. In this way, in addition to the analog current signal, further
data can be exchanged with the field device via the superimposed digital
signal.
The HART communication can also be used for the FDT/DTM concept.
The TwinCAT FDT container enables the integration of field device DTMs
into TwinCAT Engineering, so that the device configuration and diagnostic
functions are available directly within the development environment.
As the FDT concept only supports 32-bit, it cannot be used in the 64-bit
TwinCAT XAE Shell.
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