Safety Rated Sequential Start-ups, using SIMATIC Safety Matrix
Objective of the Application
Although most facilities embrace ANSI/ISA 84.00.01-2004 (IEC 61511) and the Safety Life Cycle (SLC) as the best way to comply with regulatory requirements (Like OSHA in the USA for example), there are specific instances when most operations deviate from the standards i.e. during start-ups, shut-downs and process transitions. Bypassing, inhibiting or masking is a common practice during these plant conditions, seriously compromising the Safety Integrity of the substituted functions.
The presented project example examines how Simatic Safety Matrix could be used to simplify the development and implementation of automated permissive sequences without the need to remove Safety Instrumented System (SIS) protections, or compromise the Safety Integrity Level (SIL) of any Safety Instrumented Function (SIF), whilst still including verification and validation as required by safety standards.
Main Contents of this Application Note
The following issues are discussed in this application note:
- The timing and process variable constraints of an override (Changing variable thresholds or limits)
- Priority in intersections classes/conditions
- Causes, type of timers and effect monitoring
This document is valid for PCS 7 version V7.1 SP1 or higher and Safety Matrix V6.2
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|Safety Rated Sequential Start-ups, using SIMATIC Safety Matrix|
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