Specifications

Allen-Bradley ControlLogix Ethernet Driver Help

Logix Options

Descriptions of the parameters are as follows:

l Protocol Mode: This parameter specifies how Logix tag data is 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.

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

l Online Edits: When enabled, the driver synchronizes 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.

l Offline Edits: When enabled, the driver synchronizes 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.

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

Native tag address.

l Automatically Read String Length: When checked, the driver automatically reads the LEN member of

the STRING structure whenever the DATA member is read. The DATA string is 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 bypasses the LEN member read

and terminates 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 does not terminate DATA according to this reduced length. The default

setting is Yes.

l Default Type: This parameter specifies the data type 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 retrieves the Logix tag's data type from the controller when a