Who I Am
Marcus Webb has spent 14 years working as a controls engineer and field technician across automotive, food processing, and packaging plants, specializing in Siemens S7 and Allen-Bradley ControlLogix/CompactLogix platforms. He holds a B.S. in Electrical Engineering Technology and has completed Rockwell Automation and Siemens TIA Portal certification programs. After years of watching technicians lose production time searching scattered forum threads for fault code meanings, he started PLC Diagnostics to consolidate verified, firmware-specific diagnostic procedures in one place. Every guide on this site is cross-checked against official Siemens and Rockwell documentation before publication.
Why This Site Exists
Most PLC error code references online are either incomplete manufacturer PDFs or forum threads scattered across a dozen sites, none of which account for firmware version differences, cross-CPU behavior, or the actual decision tree a technician needs when a line is down. PLC Diagnostics exists to close that gap: every guide is written to answer the specific question a technician has in front of a faulted CPU, with the exact steps for the exact fault code, differentiated by platform, CPU model, and firmware version where it matters.
How Content Is Created
Every article on plcdiagnostics.com is built from official manufacturer documentation (Siemens Industry Online Support, Rockwell Automation literature library) cross-referenced against real field cases and technical forum discussions. Content is updated when manufacturers publish new firmware notes or hardware revisions. This site does not accept sponsored placements in diagnostic content, and no article recommends a product or service without a documented technical reason.