PATH CONTROLLING SYSTEM FOR INTERRUPTION FOR REPORTING INPUT AND OUTPUT OPERATION COMPLETION OF INPUT AND OUTPUT BUS DEVICE

摘要

PURPOSE:To exercise easily path control in reporting interruption for input and output operation completion, by storing the existence of actuation from a processor in a storing means by input and output equipment numbers of an interbus coupling part where a bus loop is connected, and then by performing processing. CONSTITUTION:Through respective CPU stations ST63-ST65, CPUs 51-53 are connected to Y bus loops 54-56, and through I/Os ST66-ST72, I/Os 73-79 are connected to the Y bus loops 54-56, an X bus loop 57, and a Z bus loop 58. Each of interbus coupling parts 59-61 has a means of storing the existence of actuation from a CPU by I/O numbers; when a transfer information word sent from an I/O has a frame showing end interruption, the storing means is retrieved on the basis of an I/O number in the frame and only when the contents of the storing means show the existence of actuation, an end interruption frame is sent to a bus loop close to the corresponding CPU. Then, the contents of the storing means at this time are changed to show nonexistence of actuation, thereby exercising path control in end reporting interruption.