Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
256 Installation and Operating Manual, 01/2010, A5E00085586-10
9.3.12 Application 9: Safety mode SIL3/Cat.4/PLe with three modules and high
availability (in S7 F/FH Systems only)
Introduction
Below are the wiring scheme and the parameter assignment of
SM 336; F-AI 6 x 0/4 ... 20 mA HART for
● Application 9: Safety mode SIL3/Cat.4/PLe for "2oo3 evaluation with high availability.
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables
Diagnostic messages of SM 336; F-AI 6 x 0/4 ... 20 mA HART
and
Diagnostic messages and associated corrective measures for SM 336; F-AI 6 x 0/4 ...
20 mA HART
in 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 9
Six process signals can be connected to three redundant modules in this interconnection
variant. Sensor supply Vsn is provided by the module for 6 channels. The sensors can also
be connected to an external sensor supply (see Figure
External sensor supply, 2-wire
transducer for SM 336; F-AI 6 x 0/4 ... 20 mA HART
in chapter "Properties, front view, wiring
diagram and block diagram (Page 224)".
Note the influence of faults with a common cause.
You can use i
nterconnection schemes A to D for this application.
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Figure 9-37 2oo3 evaluation with 3-fold redundant F-SMs, three-channel transducer
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