The Automated Independent Backup (AIB) system is a stand-alone, automated safety instrumented system (SIS). It is suitable for legacy process control systems where users have implemented safety logic in a distributed control system’s (DCS) software but the DCS does not meet modern safety specifications. The system can be installed to provide either Safety Integrity Level 2 (SIL2) or Safety Integrity Level 3 (SIL3) protection, without requiring any changes to the existing hardware or DCS software. It can also be used on new control systems at a lower installed cost than a safety programmable logic controller (PLC).
