Relocation Table

Introduction

The Relocation Table allows you to organize data to optimize communication between the controller and other equipment by regrouping non-contiguous data into a contiguous table of located registers, accessible through Modbus.

NOTE: A relocation table is considered as an object. Only one relocation table object can be added to a controller.

Relocation Table Description

This table describes the Relocation Table organization:

Register	Description
60200...61999	Dynamic Memory Area: Read Relocation Table
62200...63999	Dynamic Memory Area: Write Relocation Table

For further information, refer to Modicon M251 Logic Controller PLCSystem –Library Guide.

Adding a Relocation Table

This table describes how to add a Relocation Table to your project:

Step	Action
1	Select the Application node in the Applications tree tab.
2	Click .
3	Click Add other objects > Relocation Table.... Result: The Add Relocation Table window is displayed.
4	Click Add. Result: The new relocation table is created and initialized. NOTE: As a relocation table is unique for a controller, its name is Relocation Table and cannot be changed.

Relocation Table Editor

The relocation table editor allows you to organize your variables in the relocation table.

To access the relocation table editor, double-click the Relocation Table node in the Tools tree tab:

This picture describes the relocation table editor:

Icon	Element	Description
	New Item	Adds an element to the list of system variables.
	Move Down	Moves down the selected element of the list.
	Move Up	Moves up the selected element of the list.
	Delete Item	Removes the selected elements of the list.
	Copy	Copies the selected elements of the list.
	Paste	Pastes the elements copied.
	Erase Empty Item	Removes all the elements of the list for which the "Variable" column is empty.
-	ID	Automatic incremental integer (not editable).
-	Variable	The name or the full path of a variable (editable).
-	Address	The address of the system area where the variable is stored (not editable).
-	Length	Variable length in word.
-	Validity	Indicates if the entered variable is valid (not editable).

NOTE: If a variable is undefined after program modifications, the content of the cell is displayed in red, the related Validity cell is False, and Address is set to -1.