The document discusses PLCopen, an organization that promotes standardization in industrial control programming. It describes the Instruction List programming language used by PLCs as assembler-like, and provides examples of common instruction fields and operators used in this language. Various operators and their semantics are defined for actions like loading/storing values, boolean logic, arithmetic, comparisons, program flow control, and function block invocation.

1. PLCopen
Standardization in Industrial Control programming
PLCopen 1 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Instruction List
-
an assembler type of language
Eelco van der Wal
Managing Director PLCopen
www.plcopen.org

2. PLCopen
Standardization in Industrial Control programming
PLCopen 2 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Examples of instruction fields
START: LD %IX1 (* PUSH BUTTON *)
ANDN%MX5 (* NOT INHIBITED *)
ST %QX2 (* FAN ON *)
Label OperatorOperand Comment
result := result OP operand

3. PLCopen
Standardization in Industrial Control programming
PLCopen 3 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
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

4. PLCopen
Standardization in Industrial Control programming
PLCopen 4 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Operator and Semantics
AND Boolean AND
& Boolean AND
OR Boolean OR
XOR Boolean Exclusive OR

5. PLCopen
Standardization in Industrial Control programming
PLCopen 5 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Operator and Semantics
ADD Addition
SUB Subtraction
MUL Multiplication
DIV Division

6. PLCopen
Standardization in Industrial Control programming
PLCopen 6 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Operator and Semantics
GT Comparison: >
GE Comparison: >=
EQ Comparison: =
NE Comparison: <>
LE Comparison: <=
LT Comparison: <

7. PLCopen
Standardization in Industrial Control programming
PLCopen 7 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
Operator and Semantics
JMP Jump to label
CAL Call function block
RET Return from called function or
function block
) Evaluate deferred operation

8. PLCopen
Standardization in Industrial Control programming
PLCopen 8 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
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

9. PLCopen
Standardization in Industrial Control programming
PLCopen 9 printed at 17-3-2024 PLCopen P.O. Box 2015, NL 5300 CA Zaltbommel
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