Lenze PLC Designer PLC Designer (R2-x) Uživatelský manuál stáhnout pdf (Strana 512)

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101

L-force | PLC Designer

Operands in PLC Designer

510 DMS 3.2 EN 02/2011 TD29 

10.2.3 Addressing bits in variables

In integer variables individual bits can be accessed. For this, the index of the bit to be

addressed is appended to the variable, separated by a dot. The bit-index can be given

by any constant. Indexing is 0-based.

 Note!

Bitaccess in Direct variables is not allowed.

Example:

a : INT;

b : BOOL;

...

a.2 := b;

The third bit of the variable a will be set to the value of the variable b.

If the index is greater than the bit width of the variable, the following error message is

issued: Index '<n>' outside the valid range for variable '<var>'!

Bit addressing is possible with the following variable types: SINT, INT, DINT, USINT,

UINT, UDINT, BYTE, WORD, DWORD.

If the variable type does not allow it, the following error message is issued: "Invalid

data type '<type>' for direct indexing"

A bit access must not be assigned to a VAR_IN_OUT variable!

Bitaccess via a global constant:

If you have declared a global constant, which defines the bit-index, you can use this

constant for a bitaccess.

 Note!

The project option 'Replace constants' (category Build) must be activated !

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