Specify Whether ClearSCADA Sets the Controller’s Clock

Use the Set Clock combo box on the Lufkin SAMS tab to specify whether the ClearSCADA server sets the controller’s internal clock.

Choose from:

• Disabled—ClearSCADA is not to set the controller’s clock. Choose this option if the clock is set by other means.
• Check Only—ClearSCADA checks whether the controller’s clock has drifted by more than the acceptable amount from the system time. The acceptable amount of clock drift is set to 1 hour for Lufkin SAMS controllers. If ClearSCADA detects that the controller's clock has drifted by more than this amount, it raises an alarm.
• Enabled—ClearSCADA sets the controller’s clock:
  • On establishing communications with the controller.
  • At the frequency specified on the relevant Direct Channel Form (see Define when the Server Sets the Outstations’ Clocks in the ClearSCADA Guide to Advanced Drivers). This applies to Direct and Shared controllers that are using permanent communications to communicate with ClearSCADA.
  • Whenever the driver detects a clock jump in the server (see Detecting a Change to the Server’s Clock in the ClearSCADA Guide to Server Administration).