Instruction List is one of the 5 languages supported by the IEC 61131-3 standard. It is designed for programmable logic controllers (PLCs). It is a low level language and resembles assembler. All of the languages share IEC61131 Common Elements. The variables and function call are defined by the common elements so different languages can be used in the same program.

The file format has now been standardized to XML by PLCopen.

Example

LD Speed GT 1000 JMPCN VOLTS_OK LD Volts VOLTS_OK LD 1 ST %Q75

See also

IEC standards