Applies To:
  • CitectSCADA 3.00

When the TIWAY driver receives a hardware interrupt, it acknowledges the interrupt and schedule a task to service the interrupt. There may be a long delay before that task is actually run. This delay may cause the card to lock up or cause timeouts to requests waiting to be serviced.

In version 3.0 hardware interrupts are serviced immediately and all requests given to the driver will serviced under interrupt, even when no task can be run. To stop the driver from servicing hardware interrupt immediately (the default is to service interrupts immediately) set [TIWAY]InterruptService=0.