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“Safe end position feedback” is not part of the certification by TÜV Nord and neither part of
this safety manual. Please refer to the specific safety manual for details regarding this
function.
The different configuration options of the safety functions are described in the <Configuration
(setting)/version> chapter.
4.3 Safe inputs and outputs
Safe inputs for Safe OPENING/CLOSING (Safe ESD function):
• Safe ESDa
• Safe ESDb
Safe inputs for safe stop (Safe STOP function):
• Safe STOP OPEN
• Safe STOP CLOSE
Safe outputs (indication that it might not be possible to perform the safety function:
• SIL fault
• SIL ready
For detailed information on safe inputs and outputs, refer to <Configuration (setting)/version>
chapter and <Installation> chapter.
4.4 Redundant system architecture
Besides the already described typical safety instrumented system including an actuator,
safety can be increased by integrating a second, redundant valve and actuator with actuator
controls in SIL version into the safety instrumented system. The decision on the correct
version depends on the entire system. With the redundant system architecture shown below,
actuator with actuator controls achieve SIL 3 in accordance with IEC 61508.
Figure 3: Redundant system with Safe ESD for Safe CLOSING
Figure 4: Redundant system with Safe ESD for Safe OPENING
Multi-turn actuators
SA series with Control 3.XX /NI/SIL
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