How a Small PLC Logic Change Can Cause a Reactor Explosion
In this video, we demonstrate how a small change to a PLC's control logic
can lead to unsafe physical behavior (explosion) in an industrial process.
PLC logic is often trusted implicitly, but even simple configuration or logic
changes can have serious real-world consequences.
In this walkthrough, we examine a PLC program controlling a simulated
industrial reactor, locate a key pressure setpoint, modify it to an unsafe
value, and observe how the physical process responds once the updated
program is deployed.
In this video you’ll see:
• How control logic and setpoints influence physical process behavior
• Why seemingly minor PLC changes can bypass operator expectations
• How unsafe conditions emerge from logic, not just exploits
• How cyber actions translate into real physical consequences
• Why PLC integrity is critical to both safety and security
The focus of this video is on understanding cause-and-effect in cyber-physical systems, not on teaching PLC programming or providing attack playbooks.
⚠️ Important: This demonstration is performed in a controlled lab environment. Unauthorized modification of PLC logic can cause equipment damage, safety hazards, and environmental harm. These actions should only be performed on systems you own or have explicit permission to test.
This walkthrough is part of GRFICS, an open-source industrial cybersecurity lab designed to teach OT security concepts through cyber-physical simulation.
📘 Open-source repository: https://github.com/Fortiphyd/GRFICSv3
#otsecurity #icssecurity #cybersecurity