Application 5: Safety Mode Sil3/Cat.4/Ple - Siemens S7-300 Installation And Operating Manual

Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
9.3.8

Application 5: Safety mode SIL3/Cat.4/PLe

Introduction
Below are the wiring schemes and the parameter assignment of SM 336; F-AI 6 x 0/4 ... 20
mA HART for
● Application 5: Safety mode SIL3/Cat.4/PLe for "1oo2 evaluation.
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables
messages and associated corrective measures for SM 336; F-AI 6 x 0/4 ... 20 mA HART
chapter "Diagnostic messages of SM 336; F-AI 6 x 0/4 ... 20 mA HART (Page 257)".
Current measurement 0/4 to 20 mA with 2-wire and 4-wire transducer 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) ").
You can use interconnection schemes A to D for this application.
Figure 9-32
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.
246
Diagnostic messages of SM 336; F-AI 6 x 0/4 ... 20 mA HART
1oo2 evaluation, dual-channel transducer
WARNING
External sensor supply, 2-wire transducer for
in Chapter " Properties, front view, wiring diagram and
Installation and Operating Manual, 01/2010, A5E00085586-10
Diagnostic
and
in
Fail-safe signal modules