'Data List' Editor (EtherCAT Slave Device)

Note In Data Lists, the selection in drop-down lists is done with a single-click, not with a double-click.

Toolbar button	Description
	This command is only available for controller variables which are assigned to a Safety PLC variable or to a process data item. Deletes all assignments of the selected PLC variable. The disconnected controller variable is not deleted.
	This command is only available for Safety PLC variables which are assigned to a controller variable or a process data item. Deletes all assignments of the selected Safety PLC variable. The disconnected Safety PLC variable is not deleted.
	The command is available in all Data Lists for variables which are connected to at least one other role. It is also useable for multiple mappings (e.g., threefold mapping between controller variable and Safety PLC variable and process datum). Deletes all assignments in the selected table row. Disconnected variables are not deleted.
	Opens the toolbar for local find and replace operations.

Further Info The meaning of the available context menu items is described in the topic "Data List - Toolbar, Context Menu".

Column	Property	Meaning
Process data item	Expand the column by clicking the icon in the column header to display further properties.	Identifier of the process data item.
	I/Q	Indicates the data direction of the process data item: I = Input process data which can be read by the application program. Q = Output process data which can be written in the application program.
	Type	Data type of the process data item (field bus data type).
	Offset	Indicates the bit offset of the process data item from the start address of the communication packet for this device/module.
Variable (PLC)	Expand the column by clicking the icon in the column header to display further properties.	Identifier of the global IEC variable.
	Type	Data type of the variable. The data type determines what kind of value the variable can have and it defines the initial value, range of possible values and the number of bits. Left-clicking into the cell shows the selectable data types represented by a corresponding symbol and the data type name.
	Usage	Keyword that defines the scope of the variable. In the Data List of the controller, only 'Global' is available for declaring resource-global variables which can be used in all POUs of the related resource.
	Comment	User-defined comment. The input is limited to 128 characters.
	Init	According to IEC 61131-3, initial values can optionally be assigned to variables. This means that a variable which is going to be used for the first time in the controller program is used with its initial value. The initial value has to fit to the selected data type. Note Variables which are assigned to physical inputs cannot be initialized. Note If you are using PLCnext Engineer in another user interface language and/or with another Windows system locale than English you must enter numeric values with a '.' as decimal separator (always according to the English standard). This applies, for example, when entering initial values in variables tables or REAL/LREAL literals in the code.
	Retain	Specifies that a retentive variable is declared. The value of a retentive variable is kept in the controller memory even if power is switched off. In case of a warm start, the last value of the variable is going to be used. The 'Retain' attribute is not allowed in combination with the 'Constant' attribute and vice versa. Also refer to the topic "Retain Handling" for further information.
	Constant	Declares a constant variable (VAR_CONSTANT acc. to the IEC 61131-3). The value of a constant variable cannot be changed by the running application (read-only access). See the topic "Constant Variables" for further information.
	OPC	Specifies that the variable is visible for the integrated OPC UA server and can therefore be subscribed by OPC clients. Note This attribute is not relevant for the OPC UA PubSub communication. Global variables can be added to a PubSub data set even if the checkbox is not selected.
Variable (Safety PLC) This column and its properties are only available if a Safety PLC is used in your project.	Expand the column by clicking the icon in the column header to display further properties.	Identifier of the safety-related global IEC variable.
	Type	Data type of the variable. The data type determines what kind of value the variable can have and it defines the initial value, range of possible values and the number of bits. Left-clicking into the cell shows the selectable data types represented by a corresponding symbol and the data type name.
	Usage	Keyword that defines the scope of the variable. In the Data List of the controller, only 'Global' is available for declaring resource-global variables which can be used in all POUs of the related resource.
	I/Q/M	Data direction of the variable. This property is only available for Safety PLC variables (of both standard and safety-related data types). M = variable is marker variable. It is neither connected to a device input/output nor it is used as exchange variable. I = variable can be read by the safety-related application. It can be connected to an input process data item or it can be used as "incoming exchange variable" which is written in the standard (non-safety-related) application. Q = variable can be written by the safety-related application. It can be connected to an output process data item or it can be used as "outgoing exchange variable" which is read in the standard (non-safety-related) application. Further Info Refer to the topics "Role Mapping in Data Lists" and "Exchanging Data between Controller and Safety PLC".
	Comment	User-defined comment. The input is limited to 128 characters.
	Init	According to IEC 61131-3, initial values can optionally be assigned to variables. This means that a variable which is going to be used for the first time in the controller program is used with its initial value. The initial value has to fit to the selected data type.
	Confirm	The 'Confirm' flag is active and must be selected under the following circumstances: Each time you assign a process data item to a safety-related variable (thus defining a safety-related input or output variable). Each time a process data item which is assigned to a safety-related variable was modified in the PLANT.1 PLCnext Engineer reports a warning message in the Safety Log (MESSAGES window) as long as 'Confirm' is not selected for all safety-related I/O variables. The 'Confirm' flag is automatically deselected after replacing a safety-related module. In this case, you must repeat the I/O verification and set 'Confirm' again for the affected variables. Observe the hazard message and information given in the topic "Replacing Devices", section "Safety requirements when replacing the Safety PLC...".

1	After modifying the PLANT structure by adding, deleting or replacing devices, the following applies:

WARNING

Unintended equipment operation Inspect and correct as necessary any global I/O variables related to physical, safety-related I/Os whenever you modify the PLANT structure. Whenever you add, delete or exchange devices in the PLANT, validate the physical wiring of your safety-related architecture and thoroughly test the application.