Safety Instrumented Systems

Safety Instrumented Systems (SIS) play a vital role in providing the protective layer functionality in many industrial process and automation systems.


These systems may also be referred to as Emergency Shutdown Systems (ESD) or Process Shutdown Systems (PSD). Key international standards, concepts and best practices must be adhered to when implementing a Safety Instrumented System.



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It is therefore vital that clients appoint a supplier who has the experience and project implementation techniques to deliver a fully compliant system. GSYS has specific expertise in the design, supply, validation and commissioning of Safety Instrumented Systems including emergency shutdown, process shutdown and fire & gas systems.

GSYS operates a Functional Safety Management System in accordance with IEC61508/61511 to ensure that our solutions are fully compliant with relevant standards and can be easily incorporated into our clients’ Functional Safety Lifecycles.


We supply turn-key solutions designed around independently approved fail-safe PLC systems including

  • Siemens S7-300F & Siemens S7-400F/FH
  • Rockwell ControlLogix    


Our standard documentation packs include

  • Functional Safety Management Plans
  • Safety Requirements Specifications
  • System Hardware and Software Specifications
  • Verification & Validation Plans
  • Safety Analysis Reports including detailed SIL calculations