Lenze DDS v2.0 - Manual (Page 9)

Introduction to IEC 61131-3 programming
The software model
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DDS-IEC61131 EN 2.0
Overview: IEC 61131-3 standard operators
Arithmetic operators
ADD
Addition
MUL Multiplication
SUB Subtraction
DIV Division
MOD Remainders
EXP Exponentiation
MOVE Assignment
Bit-shift operators
SHL
Shift to LHS
SHR Shift to RHS
ROR CW rotation
ROL CCW rotation
Bit-string operators
AND
Bit-by-bit AND of bit operands
OR Bit-by-bit OR of bit operands
XOR Bit-by-bit XOR of bit operands
NOT Bit-by-bit NOT of bit operands
Selection operators
SEL
Binary selection
MAX Maximum
MIN Minimum
LIMIT Limit
MUX Multiplexer
Comparison operators
GT
Higher than
LT Lower than
LE Lower or equal
GE Higher or equal
EQ Equal
NE Not equal
2.3 Control restart
The software model of IEC 61131-3 also defines the restart behaviour of the control.
Cold start
With cold starts, the program is loaded again. All variables are reset to their initial value. They either
use a standard initial value (e.g. 0 or FALSE) or the initial value indicated in the variable declaration
(optionally). All tasks of the resource are started.
Warm start
With warm starts (restarts), variables are not set to their inital value but continue with the value saved
before the interruption.
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