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. The parts of the IEC 61131 standard are prepared and maintained by working group 7, programmable control systems, of subcommittee SC 65B of Technical Committee TC65 of the IEC.

Sections of IEC 61131

Standard IEC 61131 is divided into several parts:[3]

Related standards

IEC 61499 Function Block

PLCopen has developed several standards and working groups.


  1. ^ Stevic, Tom (5 May 2017). "A very short history of PLC programming platforms". Control Design. Retrieved 11 September 2021.
  2. ^ "IEC 61131-3:2013". International Electrotechnical Commission (IEC). Retrieved 11 September 2021.
  3. ^ All parts available for "IEC 61131", IEC Webstore
  4. ^ "IO-Link im Durchblick".
  5. ^ "IEC 61131-9:2013 | IEC Webstore | water automation, water management, smart city".
  6. ^[bare URL PDF]