There are two main kinds of accidents that are worth worrying about: collisions and derailments. An interlocking is safe if it prevents such accidents from happening. Of course, an interlocking cannot provide 100% prevention as long as human operators are taking an active part of the operation. But the interlocking can and will make [...]
For the next big advancement in the development of faster and more efficient transportation, the railway industry has to go through a digital transformation. For this, safety is critical. The solution? New, more efficient verification methods. Perhaps the most apparent safety verification method is testing, and indeed, it is still the backbone of [...]
Study our recorded webinar with Ansys Together with Ansys, we held a webinar on Formal Verification for Model-Based Development. Prover supplies the model checker PSL, which powers Ansys new SCADE Suite Design Verifier. It provides the new Design Verifier with a great leap in performance and enables state-of-the-art formal verification of SCADE-models, including IEEE 754 [...]
2017 an idea was born at Prover Technology. We wanted to create a forum for sharing experiences, best practices, and for networking. Our intention was to gather leading signaling management peers from all over the world to discuss the latest evolutions of design automation and formal verification– software technologies to automate design and verification of [...]
Beginning May 18th, I led a four-day online crash course on HLL for a dozen Safety Engineers. Due to the French COVID-19 lockdown, the course was conducted via Microsoft Teams, alternating lectures and exercises. An online course is a very special experience: you can get very close to a student’s activities when sharing terminals and [...]
In this, the third and final, blog post on Signal Design Automation we will look at how Formal Verification and automation are used at Stockholm Metro to increase railway safety. The rail-based public transport system in Stockholm, Sweden is relatively complex and diverse with a combination of subway, light rail and heavy rail. It also [...]
We have now published a new date when we will run our popular webinar about Formal Verification. The date for the webinar is the 28th of April. Safety verification is vital for railway interlockings. During this webinar we will describe the general problem of safety verification and show that formal verification is the only method [...]
In a previous blog post, a playful concrete example was given to show off PSL's newly added support for IEEE 754 floating point calculations. We have tested the performance in real world industrial examples and in this blog post we will take a look at the floating point performance of PSL on a real world [...]
If you have read the first two parts of this series (Read Part 1 here and Part 2 here), then you know that verifying an interlocking that satisfies safety requirements is not an easy task to accomplish. Due to the huge size of the state space of the interlocking, neither manual methods nor testing will [...]
Hopefully you have read part 1 on this blog, where I tried to convince you that traditional methods will not get you very far when verifying safety requirements for railway interlockings. This time my task is to convince you that formal verification will get you far. In fact, all the way. So what is formal [...]
