Instruction List - an assembler type of language

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Presentation transcript:

Instruction List - an assembler type of language Eelco van der Wal Managing Director PLCopen www.plcopen.org

Examples of instruction fields Label Operator Operand Comment START: LD %IX1 (* PUSH BUTTON *) ANDN %MX5 (* NOT INHIBITED *) ST %QX2 (* FAN ON *) result := result OP operand

Operator and Semantics LD Set current result equal to operand ST Store current result to operand location S Set Boolean operand to 1 R Reset Boolean operand to 0

Operator and Semantics AND Boolean AND & Boolean AND OR Boolean OR XOR Boolean Exclusive OR

Operator and Semantics ADD Addition SUB Subtraction MUL Multiplication DIV Division

Operator and Semantics GT Comparison: > GE Comparison: >= EQ Comparison: = NE Comparison: <> LE Comparison: <= LT Comparison: <

Operator and Semantics JMP Jump to label CAL Call function block RET Return from called function or function block ) Evaluate deferred operation

Function Block Invocation Examples 1. CAL with input list: CAL C10(CU:=%IX10, PV:=15) 2. CAL with load/store of inputs: LD 15 ST C10.PV LD %IX10 ST C10.CU CAL C10 3. Use of input operators: LD 15 PV C10 LD %IX10 CU C10

FB Type Operators SR S1,R RS S,R1 R_TRIG CLK F_TRIG CLK CTU CU,R,PV CTD CD,LD,PV CTUD CU,CD,R,LD,PV TP IN,PT TON IN,PT TOF IN,PT