Detecting priority of interruption signals - using priority gates with multiple inputs, which bridge connection points of assemblies if assembly is missing

摘要

The signals, possibly external signals, interrupt normal course of a program on data transfer lines in control systems with a assemblies plugged-in to the lines. They have a multiple input priority gate at a priority line for the interrupt traffic. At least one control unit delivers a priority signal on reception of an interruption signal. A multiple input priority gate is allocated to each connected point of an assembly on the data transfer wiring plane. An active signal is applied through a resistor to an input of the priority gate. It clears the way for the priority detection signal through another gate input, so that the signal path is bridged if an assembly is missing.