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This is how a POU written in the IL looks under the corresponding TwinCAT PLC Control The instruction list editor is a text editor with the usual capabilities of FBD/LD/IL. Function Block Diagram (FBD) Function Block Diagram is a graphical IEC 61131 programming language. Ladder Diagram (LD) Ladder Diagram (LD) is a graphical programming language, which is based on the principle of electrical circuit diagrams. Instruction List (IL) Components for Automation and Control: TwinCAT NT-Realtime-System, Bus terminal, CONTINUE is an Extended Structured Text (ExST) instruction. Use theThe instruction list is very similar to the STEP5 programming language. Every instruction begins in a new line and contains one operator and one or several TwinCAT PLC Control supports all IEC 61131-3 languages. There are two textual languages and four grafical languages. texual languages. Instruction List (IL) An instruction list (IL) consists of a series of instructions. Each instruction begins in a new line and contains an operator and, depending on the type of operation, TwinCAT PLC supports different programming languages: instruction list (IL), structured text (ST), sequential function chart (SFC), function block diagram (FBD) Components for Automation and Control: TwinCAT NT-Realtime-System, Bus terminal, Industrial Function Block Diagram / Ladder / Instruction List (FBD/LD/IL) If required, IL can be enabled via the TwinCAT options. command converts the active function block code or the active Ladder Diagram to an Instruction List. If required, IL can be enabled via the TwinCAT options. (Tools > Options > TwinCAT > PLC programming environment > FBD, LD and IL > IL)