{"id":22481,"date":"2026-01-20T09:43:14","date_gmt":"2026-01-20T08:43:14","guid":{"rendered":"https:\/\/www.prover.com\/?p=22481"},"modified":"2026-03-24T12:46:18","modified_gmt":"2026-03-24T11:46:18","slug":"case-study-replacing-a-relay-interlocking-with-an-open-plc-solution","status":"publish","type":"post","link":"https:\/\/www.prover.com\/webinar\/case-study-replacing-a-relay-interlocking-with-an-open-plc-solution\/","title":{"rendered":"Case study: Replacing a relay interlocking with an open PLC solution"},"content":{"rendered":"

RECORDED WEBINAR<\/h6><\/div>

Case study: Replacing a relay interlocking with an open PLC solution<\/h1><\/div>
<\/div><\/div>

Learnings from the Stockholm Metro\u2019s open signaling pilot<\/p>\n<\/div>

Traditionally, computer-based signaling systems come with long support and maintenance commitments, often lasting 25\u201340 years. The downside is the risk of vendor lock-in<\/b>. Changes, upgrades, and even component replacements can become dependent on a single supplier\u2019s roadmap.<\/p>\n

In this webinar, we share learnings from an ongoing pilot project <\/b>in which the Stockholm Metro<\/a> is replacing a legacy relay-based signaling system with a modern PLC-based SIL 4 solution<\/b>. The pilot explores what it really takes to design and maintain an open signaling system over time so that maintenance and upgrades can be sourced from an open market, with 100% guaranteed safety.<\/p>\n

You\u2019ll get a practical view of the technical choices<\/b>, project setup<\/b>, and verification & validation approach<\/b>, what\u2019s working, what\u2019s been harder than expected, and what we\u2019d recommend if you\u2019re considering a similar modernization.<\/p>\n<\/div>

What you will learn:<\/strong><\/h5><\/div>
  • <\/i><\/span>
    Why long-term maintenance contracts create lock-in<\/b> and where the real risks appear when systems age<\/div><\/li>
  • <\/i><\/span>
    What \u201copen signaling\u201d means in practice:<\/b> standardized, interchangeable components and vendor-independent integration<\/div><\/li>
  • <\/i><\/span>
    How and why the pilot uses a standard PLC approach<\/b> to reduce dependence on specific hardware models<\/div><\/li>
  • <\/i><\/span>
    The biggest obstacles encountered so far<\/b> and how the team is addressing them<\/div><\/li>
  • <\/i><\/span>
    Why automation, code generation, and efficient V&V are critical <\/b>to make this type of project scalable and affordable<\/div><\/li>
  • <\/i><\/span>
    A project model for relay-to-PLC modernization<\/b> that enables IM\/Operator ownership with engineering-firm support<\/div><\/li>
  • <\/i><\/span>
    Prover\u2019s contributions to the project<\/b> and where we see the highest leverage<\/div><\/li><\/ul>

    This recorded session includes insights from Prover and representatives from Stockholm Metro<\/strong>.<\/p>\n<\/div><\/div><\/div>

    \"Replacing<\/span><\/div>

    Yes please, send me the recording!<\/h4><\/div>