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Handout 14
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InstMC Functional Safety 2016Conference
Input Acknowledgement (B4.9)
• TUV Certified method of writing safety data to Safety Program
• Transactional requiring authorized Initiator and Confirmer.
• Typically linked to DCS authorisation levels, includes validity checks
Restricted© SiemensAG 2013 All rights reserved.
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InstMC Functional Safety 2016Conference
• Requires some interpretation of cause and effect into LD, FB or CFC
• Not immediately intuitive - even if logically structured and well commented
• Custom engineering required (overrides, bypasses, operator graphics, reports)
Traditional Approach to implementing SIS logic