Concept V2.5

1. Concept V2.5 • Lesson 18 Objectives: • After completing this lesson, the learner will be able to: • Program control logic using the Instruction List Editor. • Demonstrate an understanding of the Instruction List Editor.

2. Concept V2.5 • Instruction List (IL) is a low level textual language which has a structure similar to a simple machine assembler. • The IEC has developed IL by reviewing the many low level languages offered by PLC manufacturers. • IL provides a wide range of operators that represent those most commonly found in proprietary instruction list languages of current day PLCs

3. Concept Programming in IL • Advantages: • The basic structure of IL is very simple and easy to learn • Ideal for solving small straight-forward problems where there are few decision points and a limited number of changes in program execution flow • Tight, optimized and fast code for performance critical sections of a program (e.g., DFBs) • Disadvantages: • Difficult to write, read and understand the program • Difficult to follow the program flow

4. Concept V2.5 • With IL the following operations can be executed: • logical (AND...), arithmetic (ADD...), compare (GT...) operations and assignments (ST, S, R). • Jumps within a section unconditioned / conditioned (JMP / JMP C, JMP CN) • Functions and function blocks unconditioned / conditioned (CAL / CAL C, CAL CN) • Before invoking an FFB, it has to be declared usingVAR and END_VAR. • Each FFB instance must be invoked once. • Multiple invocation (instantiation) is allowed! • FFB-call: • with CAL and a list of input parameters or • with CAL and Load/Save of the input parameters or • by using the input operators.

5. Concept V2.5 • LD N Loads the value of the operand into the Accumulator Literal, variable, direct address from data type ANY • ST N Saves the value of the Accumulator in the operandLiteral, variable, direct address from data type ANY • S Sets the operand to 1 if the Accumulator content is 1Literal, variable, direct address from data type BOOL • R Sets the operand to 0 if the Accumulator content is 1 Literal, variable, direct address from data type BOOL OperatorModifierOperand / Significance

6. Concept V2.5 AND N, N(, ( Logic AND 1 OR N, N(, ( Logic OR 1 XOR N, N(, ( Logic exclusive OR 1 ADD ( Addition 2 SUB ( Subtraction 2 MUL ( Multiplication 2 DIV ( Division 2 OperatorModifier Significance 1 Literal, variable, direct address of data type ANY_BIT 2 Literal, variable, direct address of data type ANY_NUM or TIME

7. Concept V2.5 GT ( Compare : > GE ( Compare : >= EQ ( Compare : = NE ( Compare : <> LE ( Compare : <= LT ( Compare : < OperatorModifierSignificance Literal, Variable, Direct Address of data type ANY_ELEM

8. Concept V2.5 JMP C, CN Jump to label Label CAL C, CN FBNAME (name of instance) Invoking a FFB FUNCNAME Executing a function Literal, variable, direct address (data type is subject to function) ) Editing reset operations OperatorModifierOperand/Significance

9. Concept V2.5 Input Output Default Data Type Possible Data Types %IX, %QX BOOL BOOL%I %Q %IB %QB BYTE BYTE %IW %QW INT INT, UINT, WORD %ID %QD REAL REAL, DINT, UDINT, TIME

10. Concept V2.5 • When entering keywords, separators and comments, there is an immediate spell check • If a keyword, a separator or a comment is detected, it is identified with a color shading. • If unauthorizedkeywords (instructions or operators) are entered, this will be identified through color shading as well. • Spaces and tabs have no effect on syntax, they can be used anywhere.

11. Concept Programming in IL • Pull Down Menus

12. Concept V2.5 • Example: Entering a direct function call • No declaration is required!

13. Concept V2.5 • Example: Entering a function block IN, PT, Q, and ETare the labels of thepins on a TON timer

14. Concept V2.5 • Tool bar Compare with FBD CAL FFBs: Declaration Invocation Assignments

15. Concept V2.5 • Create or open IL Section • Type or select operator and modifier: Objects... • Type or select operand:  Edit  Lookup variables • Type or select FFB:  Objects  Insert FFB or click on • Insert FFB see next slide

16. Concept Programming in IL • Insert FFB • Browse and select FFB • Declaration • Invocation • Assignment

17. Concept V2.5 • Use Expand statement to complete e.g.,VAR ... END_VAR • Use Go to counterpart to find e.g.,second bracket ( ) • Enter comments, consider Options, Preferences! • Syntax check: Project  Analyze Section. • Any errors found are displayed in the message window. • Double click on the first line means: go to the line with the first error in IL.

18. Concept V2.5 • Handling, syntax check

19. This area used for Upload function Concept V2.5 • Before closing the IL section, go to  Project  Code generation options creates additional information forprocess diagnosis during code generation generates a runtime­optimized code Tests loops within ST (and IL) sections • Code generation together with the syntax check will be performed when the section is closed.

20. Concept Programming in IL IL example • Comments • FFB-Declaration • AND-Function • Assignment • FFB call • Assignment • AND-Function • FFB call • Assignment

21. Concept V2.5 Inspect Selected Watch Selected Inspect Selected

22. Concept V2.5 • Select variable with double click • Animation Selected mode or • Go to Online  Watch Selected • Repeat for next variable • Remains open until it is closed or the animation is terminated • A dialog box can be opened for each section

23. Concept V2.5 • Select variable with double click • go to menu Online  Inspect Selected • set cursor to any position on section • click left mouse button • Set cursor into cyan field • depress right mouse button • select operation mode: • Move field to another position • Delete field or • Options... see next slide

24. Concept V2.5 • Select operation mode options... • Enter Minimum/Maximum • Notice the color change Yellow Magenta