Siemens S7-300 - Application 5: Safety Mode Sil3;Cat.4;Ple

Digital modules
8.4 SM 326; DI 8 x NAMUR
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
117
8.4.6 Application 5: Safety mode SIL3/Cat.4/PLe
Introduction
Below are the wiring scheme and the parameter assignment of SM 326; DI 8 x NAMUR for
application 5: Safety mode SIL3/Cat.4/PLe.
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables in the chapter "Diagnostic Messages for SM 326; DI 8 x NAMUR
(Page 121)".
Wiring scheme of application 5
Two single-channel sensors are connected via two channels to each of two opposite inputs
of the digital module for each process signal (1oo2 evaluation). The sensor supply Vs is
made available from the digital module. The left channels of the module return the user
signals, that is, these signals are available in the I/O area of inputs at the F-CPU if no errors
are detected.
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Figure 8-30 Wiring scheme of the SM 326; DI 8 x NAMUR for application 5
WARNING
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.