Applies To:
  • CitectSCADA 2.10

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 2.10 and later the hardware interrupts are serviced immediately and all requests given to the driver will serviced under interrupt, even when no task can be run. This gives faster performance and will prevent timeouts when other windows programs are running. You may disable the driver from servicing hardware interrupt immediately with the following option: (the default is to service interrupts immediately)