Open sources

Torch Bearer is built entirely from open standards, public specifications, and openly-licensed educational material. No copyrighted vendor training content is used. Every question cites the public reference it was drawn from.

• IEC 61131-3
  PLC programming languages standard
• IEC 62443
  Industrial cybersecurity
• ISA-95 / 88 / 18.2 / 101
  Control integration, batch, alarms, HMI
• NIST SP 800-82
  Guide to Industrial Control System security
• OSHA 1910.147 / 1910.212
  Lockout/Tagout & machine guarding
• IEEE Std 1815
  DNP3 communications
• Modbus Application Protocol
  Open public specification
• OPC UA (IEC 62541)
  Industrial interoperability
• MIT OpenCourseWare
  Feedback systems & controls (6.302, 2.04A)
• Wikipedia (CC-BY-SA)
  PLC, SCADA, ladder logic, PID, VFD articles