Apparatus and methods for intrusion protection in safety instrumented process control systems.

摘要

An intrusion protection system (15b) is provided for protecting a safety instrumented system 14 from a process control system 12 comprises the steps of receiving legitimate information from a process control system intended for delivery to a safety control system 302, identifying a signature for the information and if a match occurs 308 then preventing the information being forwarded 312. The signatures may be stored in a data store. The legitimate information may comprise system unlock commands which would allow the safety system to receive a download. When unlocked the safety system may receive download from a component of the process control system such as a field device 28, 30. The system may also include a switch for manually bypassing the intrusion protection system 17b.