Historical
IEC 62443-2-4 Ed. 1.0 b:2015
Security for industrial automation and control systems - Part 2-4: Security program requirements for IACS service providers
IEC 62443-2-4:2015 specifies requirements for security capabilities for IACS service providers that they can offer to the asset owner during integration and maintenance activities of an Automation Solution.
International Electrotechnical Commission [iec]