IEC 61131

IEC 61131 is an IEC standard for programmable controllers. 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:
Related Standards.
IEC 61499 Function Block
PLCopen has developed several standards and working groups.