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Allen-Bradley ControlLogix Ethernet Driver Help

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Descriptions of the parameters are as follows:

Caution: Failure to synchronize with project changes can lead to reading from and writing to the wrong Native Tag address.

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Automatically Read String Length: When checked, the driver will automatically read the LEN member of the STRING structure whenever the DATA member is read. The DATA string will be terminated at the first null character encountered, the character whose position equals the value of LEN, or the maximum string length of DATA (whichever occurs first). When unchecked, the driver will bypass the LEN member read and terminate the DATA string at either the first null character encountered or the maximum string length of DATA (whichever occurs first). Therefore, if LEN is reduced by an external source without modification to DATA, the driver will not terminate DATA according to this reduced length. The default setting is Yes.

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Default Type: This parameter specifies the data type that will be assigned to a Client/Server Tag when the default type is selected during tag addition, modification, or import. The default setting is Default. For more information, refer to Default Data Type Conditions.

Note 1: If Default is selected, the driver will retrieve the Logix Tag's data type from the controller when a client is accessing a tag dynamically and does not explicitly assign a data type to the item. For example, a tag exists in the controller that is called "MyTag" with a data type of REAL. The corresponding client item is specified as "Channel1.Device1.MyTag" with no data type assigned. With Default specified as the

Note: Logical Non-Blocking Mode and Logical Blocking Mode are not available to Serial Gateway models.

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Online Edits: When enabled, the driver will synchronize its own project image with that of the controller project when an online project edit (or project download from RSLogix/Studio5000) is detected. This option prevents unnecessary errors from occurring during a project change. It is only available when the selected protocol is Logical Mode. The default setting is Yes.

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Offline Edits: When enabled, the driver will synchronize its own project image with that of the controller project when an offline project edit (or project download from RSLogix/Studio5000) is detected. This option prevents unnecessary errors from occurring during a project change. It is only available when the selected protocol is Logical Mode. The default setting is Yes.

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Protocol Mode: This parameter specifies how Logix Tag data will be read from the controller. This option should only be changed by advanced users who are looking to increase Client/Server Tag update performance. Options include Symbolic Mode, Logical Non-Blocking Mode and Logical Blocking Mode. The server project is interchangeable between these three modes. The default setting is Logical Non-Blocking Mode. For more information, refer to Choosing a Protocol Mode.

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