Siemens SIPART PS2 Notice De Service page 21

Figure 11 Three/four-wire connection, Intrinsic safety "Ex i"
Split-range, "Ex i"
For further information about "Split-range" operation, refer to the detailed operating instructions for your respective device
version.
Basic device "Ex i" (PA)
WARNING
Circuits
Only the certified circuits may be connected as auxiliary power supply, control and signal circuits.
Figure 12 Electrical connection for the intrinsically safe version of the standard controller
SIPART PS2 (6DR5...)
A5E03436620-01, 03/2011
21