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Programmable Logic Controllers

Programmable Logic Controllers. Day 3 Presentation PLC Languages. Agenda. IEC 61131 Standard Programming Models Instruction List Structured Text Ladder Diagram Function Block Diagram Sequential Function Charts. IEC 61131 Standard. Common and open framework Loosely defined

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Programmable Logic Controllers

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  1. Programmable Logic Controllers Day 3 Presentation PLC Languages

  2. Agenda IEC 61131 Standard Programming Models Instruction List Structured Text Ladder Diagram Function Block Diagram Sequential Function Charts Engineering Technology

  3. IEC 61131 Standard • Common and open framework • Loosely defined • Approved in 1992 • Six Main Components • - IEC 61131-1 Overview • - IEC 61131-2 Requirements and Test Procedures • - IEC 61131-3 Data Types and Programming • - IEC 61131-4 User Guidelines • - IEC 61131-5 Communications • - IEC 61131-7 Fuzzy Control Engineering Technology

  4. Programming Models IL (Instruction List) ST (Structured Text) LD (Ladder Diagram) FBD (Function Block Diagram) SFC (Sequential Function Charts) Engineering Technology

  5. Instruction List • Textual PLC Programming Language • Effectively Like Assembly Programming • Best Suited for Small Uncomplicated Programs • Instructions Consist of: • - Operator • - Modifier • - Operand • Example: AND NOT 00200 Engineering Technology

  6. Instruction List Example Engineering Technology

  7. Instruction List Example 2 Engineering Technology

  8. Structured Text • Textual PLC programming language • Effectively like BASIC programming • Easiest to troubleshoot and understand • Useful for implementing calculation-intensive functions and other difficult functions • Instructions consist of constructs • Example: Analog_Out := Error * Gain; Engineering Technology

  9. Structured Text * Sample Structured Text Code * (comments) VAR (variables) temp: INT; error: BOOL; END_VAR temp := %IW4; (addresses) IF temp > 3200 THEN error := TRUE; %QW := 200; ELSE %QW := temp / 16; END_IF; Engineering Technology

  10. Ladder Diagram • Primary programming language • Resembles original relay logic documentation • Addressing and memory is different for every manufacturer • Ladder logic scanning (rung order vs. network column) • Not purely parallel processor like relay logic Engineering Technology

  11. Ladder Diagram Engineering Technology

  12. Function Block Diagram • Graphical data-flow programming method • Interconnected blocks • Similar to Ladder Logic Engineering Technology

  13. Function Block Diagram Example Engineering Technology

  14. Sequential Function Charts • Graphical method for structuring programs • Design tool for sequential problems • Consists of: • - Interconnected steps • - Actions • - Transitions Engineering Technology

  15. Sequential Function Chart Example Engineering Technology

  16. Next Class! Diagnostics Engineering Technology

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