IEC 61131 is an IEC standard for programmable controllers. It was first published in 1993; [1] the current (third) edition dates from 2013. [2] It was known as IEC 1131 before the change in numbering system by IEC.
One aspect of PLCopen's work is the certification of programming systems that are IEC 61131-3 compliant (Logic) and in compliance with the requirements stated in the PLCopen Motion Control, Safety, OPC UA and XML specifications.
- The IEC 61131 standard gives rules for compliancy - Certification guides users towards real IEC 61131-3 programming systems (e.g. PLCopen certified products)
IEC 61131-9: Single-drop digital communication interface for small sensors and actuators (SDCI) This standard specifies a single-drop digital communication interface technology for small sensors and actuators SDCI (commonly known as IO-Link), which extends the traditional digital input and digital output interfaces as defined in IEC 61131-2 ...