Standards

IEC 61131-3

Definition

The international standard defining the PLC programming languages: ladder diagram, function block diagram, structured text, sequential function chart, and instruction list.

It also defines common elements such as data types and program organization units. Vendor implementations differ enough that portability between platforms is partial at best.

IEC 61131-3The standard behind PLC programming languages: the five languages, the common elements of data types, variables, and program organization units, what conformance actually means, and how the standard shows up in real platforms.

IEC 61131-3

Definition

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See also