Logging commanded cos and setpoints

Controller-commanded status change-of-state (COS) and analog setpoints are both logged as events. Successful commands are only logged with a success statement if Log Command Success is selected in either the Analog Output dialog box or Output tab for Status Row Edit dialog box.

The system will record any permitted command issued by the Controller (for example, if the command is aborted due to a command tag, the system will not record the event). Unsuccessful commands are logged with the command and either a communication failure statement, if communication failure prevented the command from reaching the remote, or a command failure statement, as explained in Communication Failure Timeout alarms and Communication timeouts.

Most protocols process an output command at the Remote Terminal Unit (RTU) when the RTU is successful in receiving the command.