Hello. My name is Ian Verhappen. I am one of the Solutions Architects at Willowglen Systems developing SentientQ’s SILZone safety architecture. Over my career I have supported safety systems in processing facilities, qualified as a Functional Safety Engineer and continue to participate in the development of ISA-84 safety standards working groups.
What is SIL?
SIL is an acronym that stands for Safety Integrity Level.
SIL is a measure of safety system performance, in terms of probability of failure on demand (PFD).
The PFD convention was chosen based on the numbers: it is easier to express the probability of failure rather than that of proper performance (for example: 1 in 1,000 vs. 999 in 1,000).
SIL describes the ability to reduce risk.
There are four discrete integrity levels associated with SIL: SIL 1, through SIL 4.
The higher the SIL level, the higher the associated safety level, higher the reliability, and lower the risk and lower the probability of a system failure on demand.
As the SIL level increases, the installation, maintenance costs and the complexity of the system also typically increases.
To address this problem and to easily integrate safety systems into geographically distributed SCADA environments, Willowglen developed SILZone™.
What is SILZone?
SILZone is a simple, cost effective and time efficient Willowglen solution
to address SIL related system complexity, client requests and new regulations requiring SIL systems for specific types of applications.
How does SILZone™ work?
SILZone™ works like a VPN for safety systems by providing a secure connection between end devices without being concerned about what is in the middle.
As a result, SILZone™ isolates the implementation of safety critical logic and its specific requirements from the balance of the SCADA system.
This makes SIL certifications easier; without siloing operator interface, enhancing ease-of-use at every touchpoint without compromising system safety and reliability while also controlling costs.
SILZone™ can be easily incorporated into SentientQ™ or SCADACOM™ to meet the reliability requirements of a SIL system in an integrated SCADA environment.
To learn more, check out our website.