PLC Programming

What is What in CoDeSys
Modifiers and operators in IL
In the IL language the following operators and modifiers can be used.
Modifiers:
• C with JMP, CAL, RET: The instruction is only then executed if the result of the
preceding expression is TRUE.
• N with JMPC, CALC, RETC: The instruction is only then executed if the result of the
preceding expression is FALSE.
• N otherwise: Negation of the operand (not of the accumulator)
Below you find a table of all operators in IL with their possible modifiers and the relevant meaning:
Operator Modifiers Meaning
LD N Make current result equal to the operand
ST N Save current result at the position of the operand
S
R
Then put the Boolean operand exactly at TRUE if the current result is TRUE
Then put the Boolean operand exactly at FALSE if the current result is TRUE
AND N,( Bitwise AND
OR N,( Bitwise OR
XOR N,( Bitwise exclusive OR
ADD ( Addition
SUB ( Subtraction
MUL ( Multiplication
DIV ( Division
GT ( >
GE ( >=
EQ ( =
NE (
LE (