A Safety Programmable Logic Controller (Safety PLC) is a specialised industrial controller certified to IEC 61511 or IEC 62061 safety integrity levels, designed to execute safety instrumented functions that bring a process to a safe state upon detecting hazardous conditions. Unlike standard PLCs, Safety PLCs implement redundant processing, self-diagnostics, and rigorous failure-mode analysis to achieve the high diagnostic coverage required for safety-critical robotics and industrial automation.