Commands tab
The available options on this tab are described on the next table.
Available options on the Commands tab
Option |
Description |
|---|---|
Asynchronous Write |
Allows request commands to return success immediately, without waiting for an answer, as long as its sending was successful, such as when there is an active connection. This behavior aims to facilitate operations involving sending a large number of commands, to increase general speed. However, it does not check for failures during the processing of that command on the device |
Use Single Tag Command Alias |
Instructs this Driver to create during the Tag Browsing process (please check the next note) a single Tag to send commands. If this option is not selected, then uses a Block Tag with five Elements. For more information, please check topic I/O Tags |
In case of using a simple Tag to send commands, this option informs whether the N1 parameter of this Tag is used to indicate a security check parameter of a command. The N1 parameter, in this case, must be a number between 0 (zero) and 3 (three), as the result of a logic OR between bits 0: INTERLOCKING and 1: SYNCHROCHECK |
If users are using E3 or Elipse Power as an OPC server, the command Tag can have its reading enabled, that is, the AllowRead property configured to True. This allows this Tag to receive the initial value of the CtlVal property of the referred command object, so that an OPC client previously knows the data type. After sending a command, this Driver returns an automatic reading for the same Tag, with the value written in case the operation is successful. This way, the WriteFeedBackMode parameter of this Driver, which indicates how a Tag receives a confirmation of the operation by keeping the written value, can be configured in 0: WaitNextRead, preferably. |