Module: DataLog Channel

The DataLog Channel module is used to define groups for the variable storage. The module can be added below the Datalog Manager node. This is done by the Add Submodule Instance command and the selection of the DataLogChannel module. Up to 64 DataLog channels can be added.

Dialog: Data Logging

In this dialog one or more groups can be defined which are managed by this channel. By default, the instance name of the channel module instance is available in the list.

Groups logged by this channel
New	Definition of a group The entry is added to the list by use of the Add command.
Use hashed instance paths	: The entry is not stored with the complete instance path but with the hash value of the string to save memory space. The assignment between hash and instance path is saved in a separate file.
Remove	Removes the selected group from the list
Logged variables	List of variables assigned to the lists These variables have the `{attribute 'ac_datalog' := '<group name>'}` attribute.
Refresh	Updates the list of logged variables Note: The list can only be updated if the DataLog Generator is activated.

Variables can be assigned to the groups by the ac_datalog attribute. The ac_datalog_hysteresis attribute defines the hysteresis that have to be exceeded before a variable is logged.

Example 10. Example

VAR
    {attribute 'ac_datalog' := 'DataLogChannel'}
    {attribute 'ac_datalog_hysteresis' := '0.745'}
    rLogVar : REAL;
END_VAR

Dialog: Parameters

In this dialog, the parameters for the saving the DataLog variables are defined.

Activate	`FALSE`: Variables stored by this channel are not logged.
Save in first cycle	`TRUE`: All variables of this channel will be logged in the first cycle.
Save Cyclic	Data type `TIME`: All variables of this channel will are stored cyclically. The value `T#0s` deactivates the logging.

Dialog: HMI, Information

For details about these dialogs, see the help page HMI, and Information