Lenze DDS v2.3 Bedienungsanleitung PDF herunterladen (Seite 98)

Drive PLC Developer Studio

Working with projects and objects

6-20

DDS EN 2.3

Cancel

• Closes the ”Find and replace” function.

Note!

Not implemented for Parameter Manager and code initialization.

6.1.2.15 Project check

Icon: - Menu: ProjectWCheck Keyboard: -

This menu command offers four separate subitems:

• Unused variables

• Overlapping memory areas

• Concurrent access

• Multiple save on output

The results are output in the message window.

Each of these four functions checks the status of the last compile. In other words, a project must have

been compiled correctly at least once. The menu items will not be active if that is not the case.

Unused variables

This function looks for declared variables that are not used in the program. They are output with

organization unit name and organization unit line.

Example: PLC_PRG (4) - var1

Variables in libraries will not be considered.

Overlapping memory areas

This function checks overlapping of specific memory areas during variable assignment with the help

of the AT declaration.

Example:

Assignment of variables

var1 AT %QB21: INT

var2 AT %QD5: DWORD

causes an overlap as they occupy byte 21 at the same time. Output is then as follows:

% QB21 is referenced by the following variables:

PLC_PRG (3): var1 AT %QB21

PLC_PRG (7): var2 AT %QD5

Concurring access

This function looks for memory areas that are referenced in more than one task. No difference

between read and write access. Output is then as follows:

% MB28 is referenced in the following tasks:

Task1 - PLC_PRG (6): %MB28 [read-only access]

Task2 - POU1.ACTION (1) %MB28 [write access]

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Lenze DDS v2.3 Bedienungsanleitung Seite 98