Introduction

Before any action on the data memory protection, you must activate this feature in your project settings.

In the Control Expert main window, click Tools > Project Setting > PLC embedded data . Then select the Data memory protect box and click Apply.

The data memory protection feature is supported by M580 CPU with the firmware V3.20 or later. For details, refer to the chapter Data Memory Protection.

Procedure of Protecting Located Data

Follow the procedure below to define the located data to protect:

Step

Action

1

In the Control Expert Project Browser, double-click PLC Bus to display the main rack. Then double-click on the M580 CPU (but not on the Ethernet connectors) to view its properties.

2

Select the Data Protection tab.

3

Select the boxes to enable the data protection:

%M protect

The protected area is always located at the end of the %M area. Only the starting address of the protected area can be set. The end address of the protected area is not configurable (grayed).

The end address of the protected area equals to n-1 where n is the number of available %M defined by the PLC abilities and set in the Configuration tab.

If %M protect is selected, you can enter the starting address or the %M data to protect. By default, the starting address is 0.

Unchecking the %M protection reset the starting address.

%MW protect

The protected area is always located at the end of the %M area. Only the starting address of the protected area can be set. The end address of the protected area is not configurable (grayed).

The end address of the protected area equals to n-1 where n is the number of available %MW defined by the PLC abilities and set in the Configuration tab.

If %MW protect is selected, you can enter the starting address or the %M data to protect. By default, the starting address is 0.

Unchecking the %MW protection reset the starting address.

NOTE: Array variables which are mapped on a %MW range must be entirely inside or entirely outside of the protected %MW range.

I/O protect

If selected, all I/O objects (including DTM-objects) are protected.

NOTE: except state Ram objects.

%S, %SW protect

If selected, all system bits and system words are protected.

4

Select Edit > Validate (or click the toolbar button) to save the configuration.