The PLCopen basis is provided by the world wide standard IEC 61131, and especially Part 3 - Programming Languages.
Creating reusable, hardware independent Motion Control applications via IEC 61131-3 and PLCopen Function Blocks.
PLCopen Safety integrates safety functionality into the IEC 61131-3 development environments.
Certification of IEC 61131-3 compliant programming systems.
PLCopen and OPC Foundation combine their technologies to a platform and manufacturer-independent information and communication architecture.
PLCopen added independent XML schemes to IEC 61131-3.