Siemens S7-300 - Page 298

Safety protector
10.2 Properties, Front View, and Block Diagram
Fail-safe signal modules
298 Installation and Operating Manual, 01/2010, A5E00085586-10
Safety Integrity Level SIL 2/Cat. 3/PLd without safety protector
It is not required to install a safety protector if all components connected to PROFIBUS DP
are compliant with PELV requirements (refer to the chapter
PELV for fail-safe signal
modules
) when operated for applications of safety class SIL2/Cat.3/PLd.
Front view
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Figure 10-1 Front view of the safety protector
Block diagram
See the block diagram of the safety protector below.
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Figure 10-2 Block diagram of the safety protector
See also
Safe Functional Extra-Low Voltage for Fail-Safe Signal Modules (Page 44)