Siemens S7-300 - Cases of Application of SM 326; DI X 8 NAMUR

Digital modules
8.4 SM 326; DI 8 x NAMUR
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
113
8.4.3 Cases of application of SM 326; DI x 8 NAMUR
Selecting the application
The figure below helps you to select an application based on availability and fail-safe
operation requirements. The next pages provide information on the module wiring for specific
applications, and on the parameters to set in
STEP 7 using the S7 Distributed Safety or S7 F
Systems
optional package.
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Figure 8-27 SM 326; DI x 8 NAMUR - Selecting an application
WARNING
The maximum Safety Integrity Level is determined by the sensor quality and the length of
the proof test interval to IEC 61508 standard. If the sensor quality does not meet
requirements of the safety class, wire it to two channels for redundant operation.