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Introduction to IEC 61131-3 programming

The software m odel

l 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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Lenze DDS v2.0 Manual de usuario Pagina 9

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