The main non-sector specific functional safety standard is IEC 61508. Within IEC 61508 it references IEC 62443 for security. IEC 62443 is entitled “Security for industrial Automation and Control systems” or “Industrial communication networks – Network and system security” depending on where you look. At last count it consisted of 13 parts and almost 1000 pages. The standards are being developed and published via the ISA (international society of automation engineers) committee ISA99 and the IEC (international electro-technical committees) IEC TC 65. IEC TC 65/SC 65A also publishes the functional safety standards IEC 61511 and IEC 61508 which is our first clue that the two areas might be related.