turck IM35-11Ex-Hi/24VDC Bedienungsanleitung Seite 23

Anhang – EXIDA-Report FMEDA Turck 04/07-14 R001
3 Description of the analyzed module
3.1 Isolating Transducers IM33-22Ex-Hi/24VDC
The isolating transducer IM33-22Ex-Hi/24VDC is used to energize intrinsically safe 2-wire
HART® transducers in the hazardous area and to transmit the measuring signals to the non-
hazardous area.
In addition to analog signals, digital HART® communication signals can be transferred
bidirectional.
Further it is possible to connect active 2-wire (II) and passive 3-wire (I) transmitters. The device
features two channels with 0/4...20 mA input and output circuits.
The input circuits are galvanically isolated from the output circuits, the supply voltage and from
each other.
The input signals are transferred without attenuation (1:1 transfer) to the output circuits in the
non-hazardous area. Due to the 1:1 transmission characteristic, wire-break or short-circuit
conditions in the transducer circuit are indicated by an output current of 0 mA or > 22.5 mA,
respectively.
Figure 1: Block diagram of the Isolating Transducer IM33-22Ex-Hi/24VDC
The Isolating Transducers IM33-22Ex-Hi/24VDC are considered to be Type A components with
a hardware fault tolerance of 0.
The description above is valid for all versions of the isolating transducer with the exception that
this version has two input and two output channels. The differences between the versions are
described in Table 1.
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