The Pilz PSS 3074 is a programmable safety controller designed for industrial automation, featuring 48 input channels (including 6 alarm inputs), 18 single‑pole outputs, 8 dual‑pole outputs, and a 24 VDC power supply with an IP20 enclosure. Common failure modes in this class include power supply degradation, input/output relay wear, firmware corruption, and overheating of the internal PCB due to inadequate ventilation or dust accumulation. First‑check diagnostics should verify that the 24 VDC supply is within spec, inspect all I/O terminals for corrosion or loose connections, and review the on‑board 4‑digit status display or error logs for fault codes before proceeding to deeper hardware inspection.[oss-gpt-20b]