Siemens S7-300 Installation And Operating Manual page 247

Current measurement 0/4 to 20 mA with 2-wire and 4-wire transducer, transducer via one channel, for
application 5
Three process signals can be connected to a module in this interconnection variant. Sensor
supply Vsn is provided by the module for 3 channels. The sensors can also be connected to
an external sensor supply (see Figure
SM 336; F-AI 6 x 0/4 ... 20 mA HART
block diagram (Page 224) ").
Interconnection types A to D can be used for this application.
Figure 9-33
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.
Note
If you are using
HART field device only for the channel with the lower channel number.
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
1oo2 evaluation, single-channel transducer
WARNING
SIMATIC PDM
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
External sensor supply, 4-wire transducer for
in Chapter " Properties, front view, wiring diagram and
as the engineering tool for your HART field device, create a
Analog modules
247